Microsoft’s April 2026 cumulative security update for Windows 11 is causing significant disruptions for users relying on third-party backup software, triggering an MS-DEFCON level 3 advisory from security patch analyst Susan Bradley at AskWoody.

The problematic update, KB5083769, applies to Windows 11 versions 24H2 and 25H2 (OS Builds 26200.8246 and 26100.8246), released on April 14, 2026.

At the root of the issue is a malfunction in Microsoft’s Volume Shadow Copy Service (VSS) a critical Windows component that enables snapshot-based backup and restore operations across a wide range of enterprise and consumer backup solutions.

When VSS fails, backup jobs either stall or terminate with timeout errors, leaving systems without scheduled backup coverage a serious risk for both individual users and enterprise environments.

Affected Vendors

Multiple third-party vendors have already acknowledged the problem:

• UrBackup — File backups are failing post-update; the vendor recommends uninstalling KB5083769 for impacted users
• Macrium Reflect — VSS-related failures reported in active Reddit community threads; investigation underway
• Acronis Cyber Protect Cloud — Backup jobs failing with the error “Microsoft VSS has timed out during snapshot creation”; Acronis recommends uninstalling the update and rebooting

It is important to note that not all backup solutions are affected. Microsoft’s native Windows 11 cloud-based Backup feature does not rely on VSS and remains unaffected.

The VSS component is also foundational to Microsoft’s forthcoming Point-in-Time Restore (PITR) feature for Windows 11, first previewed during Microsoft Ignite in November 2025 via Insider build KB5070307.

Since PITR has not yet reached general availability, most standard users face no additional risk from that front.

Mitigation Steps

For users experiencing backup failures after installing KB5083769, the following rollback procedure is advised:

1. Navigate to Settings → Windows Update → Update History
2. Scroll to Related Settings and click Uninstall Updates
3. Locate Security Update for Microsoft Windows (KB5083769)
4. Click Uninstall and allow the system to reboot
5. Return to Windows Update and Pause Updates to prevent reinstallation

Before uninstalling, verify whether your specific backup solution is impacted by checking your vendor’s official support channels and forums.

MS-DEFCON 3 signals that administrators should hold off on deploying KB5083769 in production environments until Microsoft issues a fix, Susan Bradley at AskWoody said.

A patch addressing the VSS regression is anticipated in an upcoming out-of-band or May 2026 cumulative update.

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Microsoft has officially launched its new “agentic” capabilities for Copilot in Outlook, transforming the AI from a basic drafting assistant into an autonomous digital agent.

Announced on April 27, 2026, this major update enables Copilot to manage both your inbox and calendar proactively.

By automating complex, ongoing tasks, Microsoft aims to reduce digital fatigue and drastically streamline daily enterprise workflows.

For cybersecurity and IT professionals managing high volumes of alerts and communications, this autonomous triage could become a critical productivity tool.

Autonomous Inbox Management

Previously, Copilot in Outlook primarily assisted with single tasks, such as writing an email or summarizing a thread.

Now, the new agent mode works continuously in the background to keep operations moving.

Copilot actively prioritizes incoming messages, surfaces emails that require urgent responses, and automatically drafts follow-ups for unreturned messages.

Users can also instruct the AI to create complex inbox rules, such as automatically tagging leadership emails as “High Priority” if the user is on the direct “To:” line.

For employees returning from leave, Copilot can summarize missed emails, highlight urgent items, draft brief update emails, and suggest messages to archive safely.

Importantly, the AI shows its workflow steps transparently. This allows users to review, adjust, or stop actions at any time, maintaining essential oversight over confidential data.

Intelligent Calendar Automation

Copilot’s new capabilities extend deeply into calendar management. Scheduling a meeting is simple, but resolving conflicts and reprioritizing tasks takes significant administrative effort.

Copilot now continuously monitors schedules to keep your day on track. It can automatically resolve booking conflicts, reschedule overlapping 1:1 meetings, rebook conference rooms, and proactively block out focus time.

Users can prompt the AI to draft detailed meeting agendas based on specific goals, open blockers, and owner assignments.

It can also protect off-hours by automatically following large meetings outside the typical workday instead of accepting them.

Strategic Time Management Features

Beyond basic scheduling, Copilot helps users align their time with their actual corporate priorities.

Copilot can execute several advanced prompts:

• Tracks unreplied emails and drafts polite reminders after 24 hours.
• Pulls relevant project data from the past week to draft high-importance update emails.
• Analyzes upcoming calendars to recommend which meetings to decline, delegate, or convert to async updates.
• Gathers context and identifies potential risks to help users prepare for upcoming client meetings.

As AI takes on more autonomous roles, maintaining user control over sensitive corporate communications remains critical.

Microsoft has designed these agentic features to keep the human in the loop for final approvals.

The new Copilot agent capabilities are currently available for early access through Microsoft’s Frontier program for all Outlook platforms, including Windows and web environments.

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Microsoft has acknowledged a service degradation affecting Outlook.com, with users reporting difficulties accessing the platform as of Monday, April 27, 2026.

The company’s official Microsoft 365 Status account on X confirmed the incident, noting the last status update at 10:15 AM UTC.

We're investigating an issue where users may be experiencing intermittent issues accessing https://t.co/ZUfyjth6sU. For more information, please visit https://t.co/uSHwRmXFJZ.

— Microsoft 365 Status (@MSFT365Status) April 27, 2026

Users across multiple regions are experiencing disruptions when attempting to access Outlook.com, including intermittent failures to load the inbox, delayed email delivery, and complete inability to reach the webmail interface.

The outage is part of a broader pattern of Microsoft 365 service instability that has dogged the platform throughout early 2026, following a significant multi-service disruption in January that affected Outlook, Microsoft Teams, Defender, and SharePoint.

Microsoft’s official service health dashboard listed the event under “Service Degradation” — a classification used when core functionality is impaired but not entirely offline — distinguishing it from a full outage scenario.

A separate but related degradation affecting Outlook Classic with the Microsoft Teams Meeting Add-in has been confirmed as triggered by an incompatible legacy Outlook build version remaining active in certain user environments.

Microsoft confirmed on April 27 at 08:58 AM UTC that the fix deployment is continuing to progress as expected and is scheduled for completion by Tuesday, April 28, 2026.

As a temporary workaround, Microsoft has advised affected users to follow steps published in the admin center’s More Info section to bypass impact while the broader rollout completes.

The company also noted that temporary version restrictions placed on some users will be lifted once the fix is fully deployed.

This latest incident adds to growing concerns over Microsoft 365 reliability. In April 2026, an earlier outage took down Microsoft 365, Teams, Outlook, and Azure simultaneously, with Microsoft attributing the disruption to an external service dependency affecting multiple platform components.

The January 22, 2026, incident similarly forced Microsoft engineers to implement load-balancing efforts and targeted server restarts to restore normal operations.

Users and administrators can monitor live service health at status.cloud.microsoft or check the Microsoft 365 admin center under Health > Service Health for real-time incident updates.

Organizations relying on Outlook.com for critical communications are advised to implement contingency email procedures until full service restoration is confirmed.

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Microsoft has officially released a new Group Policy setting that allows IT administrators to silently uninstall the Microsoft Copilot app from managed Windows 11 devices, a move that signals a broader enterprise shift away from bundled AI bloat and toward user-choice-driven deployments.

The policy, named RemoveMicrosoftCopilotApp, became broadly available on April 14, 2026, as part of the April 2026 Patch Tuesday security update.

It is included in Windows 11 version 25H2 with update KB5083769 and later builds, and is accessible via both Policy CSP and traditional Group Policy Object (GPO) management.

Group Policy to Remove Windows 11 Copilot

The RemoveMicrosoftCopilotApp setting provides IT teams a targeted, non-disruptive method to uninstall the consumer-facing Microsoft Copilot app from enterprise endpoints.

Once enabled, administrators set the policy value to 1 to trigger removal or 0 to disable it a clean integer-based toggle consistent with existing Windows policy frameworks.

However, the policy is deliberately constrained. It will only activate when all three of the following conditions are simultaneously met on a device:

• Microsoft 365 Copilot is also installed on the same device
• The Microsoft Copilot app was not manually installed by the end user
• The Copilot app has not been launched in the last 28 days

This three-factor security mechanism ensures the policy does not disrupt active users who rely on the standalone Copilot app, making it a precision tool rather than a blunt removal instrument.

Administrators can locate the new policy within the Group Policy Editor by navigating to User Configuration → Administrative Templates → Windows AI → Remove Microsoft Copilot App.

It is also accessible via the Policy CSP OMA-URI path at ./User/Vendor/MSFT/Policy/Config/WindowsAI/RemoveMicrosoftCopilotApp and the device-level equivalent path.

The setting applies to Pro, Enterprise, Education, and IoT Enterprise SKUs, effectively covering the full spectrum of managed organizational environments.

It is important to note that this policy performs a one-time uninstall, not a persistent block. Users can reinstall the Copilot app from the Microsoft Store if they choose.

Administrators seeking to permanently prevent reinstallation will need to combine this policy with additional enforcement tools such as AppLocker, Windows Defender Application Control (WDAC), or Intune uninstall profiles.

The release comes amid a wider trend of Microsoft “unbundling” AI features from core Windows components following sustained enterprise feedback about unsolicited AI integrations.

By offering this controlled removal capability, Microsoft is positioning the enterprise Copilot experience around Microsoft 365 Copilot as the single, sanctioned AI assistant for managed corporate environments, streamlining the AI toolset while giving IT teams the control they have long demanded.

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Anthropic’s “Project Deal” has demonstrated that AI agents can autonomously negotiate and close real-world transactions, but the experiment also surfaced a quiet, troubling asymmetry: not all AI representations are created equal.

In December 2025, Anthropic transformed its San Francisco office into a live classified marketplace, a Craigslist-style platform with a critical twist.

Rather than negotiating themselves, the company’s 69 employees handed the reins to Claude AI agents.

Each participant was first interviewed by Claude to capture their selling preferences, buying wish lists, and personal instructions.

Those inputs were then converted into custom system prompts, and the agents were set loose in the company’s Slack workspace, with zero human intervention thereafter.

The Slack channel cycled through agents, who autonomously posted listings, made counteroffers, and sealed deals on real physical items ranging from snowboards to bags of ping-pong balls.

Claude AI Agents Close 186 Deals

The results were striking. Across more than 500 listed items, Anthropic’s 69 AI agents closed 186 deals totaling just over $4,000.

These weren’t frictionless, one-click purchases; agents engaged in multi-turn price negotiations, showcasing contextual reasoning and personalization.

Our experiment had a few quirks.

One of our colleagues told Claude it could purchase something for itself. It chose to acquire 19 ping-pong balls.

We’re keeping them in our office on Claude’s behalf. pic.twitter.com/NM8VtH1KJM

— Anthropic (@AnthropicAI) April 24, 2026

One agent pitched a bag of ping-pong balls as “perfectly spherical orbs of possibility,” and another, recalling a coworker’s casual mention of a snowboard brand in a prior chat, matched the exact model the buyer wanted.

Post-experiment surveys revealed that 46% of participants said they would pay for a similar service in the future, underscoring genuine user enthusiasm for AI-mediated commerce.

Beneath the success, Anthropic ran a secret parallel experiment, one that raises serious questions. Participants were randomly assigned either the flagship Claude Opus 4.5 or the lightweight Claude Haiku 4.5 as their negotiating agent, without being told which model represented them.

The performance gap was measurable and significant. Opus-represented sellers earned $2.68 more per item on average, while buyers saved $2.45 per item, and Opus users completed approximately 2.07 more deals overall.

Despite this disparity, post-experiment surveys showed that participants with weaker models were entirely unaware of their disadvantage.

The findings highlight a dual reality for agentic AI commerce. On the upside, AI agents can dramatically reduce friction in peer-to-peer trade while achieving outcomes that participants rate as fair.

On the downside, when both parties don’t use equally capable models, the smarter agent silently wins a dynamic that mirrors real-world information asymmetry and could, at scale, enable exploitation, manipulation, or AI-assisted scams.

Anthropic’s Project Deal is less a product launch and more a proof-of-concept warning: AI agents work in marketplaces, but fairness requires that everyone gets the same caliber of advocate.

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Microsoft is actively investigating a known issue preventing some users from joining Microsoft Teams meetings on Windows devices, following a recent update to the Microsoft Edge browser.

The disruption is affecting organizations, including those using NHSmail infrastructure, with reports indicating that scheduled meetings and link-based meeting joins are the primary points of failure.

The issue stems from a regression introduced in a recent Microsoft Edge release, which has caused failures for a subset of users attempting to join Teams meetings.

The problem appears to be exclusive to Windows environments and is specifically triggered when users try to access scheduled meetings or join via shared meeting links, two of the most common entry points in enterprise collaboration workflows.

Microsoft confirmed the root cause in its latest advisory: “A recent Edge release introduced a regression that’s resulting in failures for some users when attempting to join meetings in Microsoft Teams.”

The incident, tracked under Microsoft reference TM1288497, has been confirmed to affect organizations at scale. Users encountering the issue may find themselves unable to connect to meetings entirely, disrupting day-to-day operations that rely heavily on Teams-based communication.

NHS organizations referencing this under INC46806917 are among those impacted. Microsoft notes the scope of impact may be updated as the investigation continues.

While Microsoft works toward a permanent fix, a simple workaround has been identified: restarting the Microsoft Teams client can restore the ability to join meetings in most affected cases. IT administrators and end users are encouraged to apply this step as an immediate mitigation while awaiting the full resolution.

As of March 23, 2026, at 08:05 AM, Microsoft’s engineering team reported they are analyzing diagnostic data and reviewing recent service changes that may be contributing to the problem. The team has committed to providing a timeline for next steps once one becomes available.

The next scheduled update is expected on Thursday, April 23, 2026, at 6:00 PM UTC, at which point Microsoft is expected to share further findings or a remediation plan.

Recommended Actions

• Restart the Microsoft Teams desktop client if meeting join failures occur
• Avoid relying solely on Edge when joining meetings until the issue is resolved
• IT teams should monitor the Microsoft 365 admin center and NHSmail service alerts for updates

Organizations dependent on Teams for critical operations should ensure staff are aware of the workaround to minimize disruption during the ongoing investigation.

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Microsoft is actively investigating a widespread authentication issue affecting users attempting to access Microsoft 365 web-based services through Google Chrome version 147.

The problem, first reported on April 16, 2026, has left a significant number of users unable to properly load or interact with Microsoft 365 applications in their browser.

According to Microsoft’s official service health dashboard, users running Google Chrome version 147 are experiencing failures when accessing Microsoft 365 web services.

Google Chrome 147 Compatibility Issue

The root cause appears to be tied to specific authentication configurations that are incompatible with the latest Chrome release. Microsoft confirmed the issue impacts the browser’s ability to complete authentication flows correctly, preventing users from signing in or loading web-based Microsoft 365 apps as expected.

The company stated it is actively working to identify all impacted authentication configurations and implement the necessary remediation steps.

We're investigating an issue with accessing some web-based Microsoft 365 services when using the latest version of Google Chrome. We're currently taking action to address the problem. More details can be found in https://t.co/uSHwRmXFJZ or under MO1281730 in the admin center.

— Microsoft 365 Status (@MSFT365Status) April 16, 2026

Microsoft’s engineering team has been providing rolling updates throughout the day, with status notices issued at 1:20 PM, 3:29 PM, 4:18 PM, 5:48 PM, and most recently at 6:10 PM IST on April 16.

The disruption specifically targets users on Google Chrome version 147, which appears to have introduced a behavioral change that conflicts with Microsoft 365’s authentication infrastructure.

Services accessed through the browser, including Outlook on the web, Microsoft Teams (web client), SharePoint Online, and OneDrive, are among those potentially affected. Users on other browsers or desktop clients are not reported to be impacted.

Organizations relying heavily on browser-based Microsoft 365 workflows may face productivity disruptions, particularly in environments where Chrome is the standardized enterprise browser.

Workarounds

Microsoft has advised affected users to try the following steps while the fix is being rolled out:

• Refresh the browser page, which may restore access in some cases as Microsoft applies backend configuration changes
• Switch to an alternative browser, such as Microsoft Edge, Firefox, or Safari, as a temporary workaround
• Use Microsoft 365 desktop applications where available to avoid browser-dependent authentication flows
• IT administrators should monitor the Microsoft 365 admin center service health dashboard for real-time updates

Microsoft has not yet disclosed the specific technical change in Chrome 147 that triggered the conflict, nor has it provided a definitive estimated time to resolution. The frequency of status updates throughout April 16 suggests engineers are actively engaged and progressing toward a fix.

Users and administrators are encouraged to check the Microsoft 365 Service Health Dashboard for the latest developments as the situation continues to evolve.

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Anthropic has officially launched Claude for Word in public beta, bringing its AI assistant directly into Microsoft Word as a native sidebar add-in for Team and Enterprise users on both Mac and Windows platforms.

The integration marks a significant step in Anthropic’s push to embed Claude into everyday productivity workflows beyond chat-based interactions.

Claude for Word enables users to draft, edit, and revise .docx files directly from a persistent sidebar within Microsoft Word, eliminating the need to switch between applications.

Unlike basic clipboard-and-paste AI workflows, the integration preserves native document formatting and surfaces all AI-generated edits as Microsoft Word’s tracked changes, keeping the revision history intact and fully reviewable by human editors.

This “AI-powered redlining” approach means users can prompt Claude to rewrite a section or sharpen an argument, then accept or reject each suggestion just as they would with a human collaborator’s markup.

Claude for Word is now in beta.

Draft, edit, and revise documents directly from the sidebar. Claude preserves your formatting, and edits appear as tracked changes.

Available on Team and Enterprise plans. pic.twitter.com/tl1mZVELNg

— Claude (@claudeai) April 10, 2026

Claude Beta for Word

One of the standout architectural decisions in the beta is shared context across Anthropic’s Office add-in family. Claude for Word connects directly with Claude for Excel and Claude for PowerPoint, meaning a single conversation thread can span all three open documents simultaneously.

Users can ask Claude to check for data inconsistencies between a Word report and its accompanying Excel model, or align narrative language in a Word file with slide content in PowerPoint, all within a unified AI session. This cross-app continuity addresses a pain point common to multi-document workflows in finance, legal, and consulting environments.

The add-in handles a range of document-centric tasks, including rewriting selected text, responding to inline Word comments, summarizing sections, and auditing documents for factual or stylistic inconsistencies.

Claude can also interpret existing comment threads and deliver revisions that directly address each note, returning an updated document with tracked changes showing every edit made.

Access is currently gated to subscribers of the Claude Team and Enterprise plans, consistent with Anthropic’s broader strategy of rolling out advanced document automation features to professional and business users first.

The launch arrives amid intensifying competition in the AI productivity space. Microsoft’s own 365 Copilot already offers deep Word integration, but early users of Claude for Word have noted its smoother document-handling and more coherent multi-app context flow as differentiators.

Anthropic also recently expanded Microsoft 365 data connectivity to all Claude plan tiers, including free users, signaling an intent to deepen its presence across the Microsoft ecosystem rather than compete with it outright.

The beta is available now at claude.com/claude-for-word, with broader plan access expected in upcoming rollout phases.

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