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Microsoft is investigating an ongoing issue causing some Windows users to face significant delays or outright failures when launching the Microsoft Teams desktop client.
The company acknowledged the problem, tracked internally as TM1466820, and confirmed it remains unresolved as engineers continue digging through service logs to find a root cause.
According to Microsoft’s incident notice, affected users encounter trouble specifically during the first launch of Teams on a Windows device. So
Microsoft is investigating an ongoing issue causing some Windows users to face significant delays or outright failures when launching the Microsoft Teams desktop client.
The company acknowledged the problem, tracked internally as TM1466820, and confirmed it remains unresolved as engineers continue digging through service logs to find a root cause.
According to Microsoft’s incident notice, affected users encounter trouble specifically during the first launch of Teams on a Windows device. Some cannot load the client at all, while others experience delays stretching up to two minutes before the app becomes usable.
For an application many organizations rely on for daily communication, even a two-minute hang at startup can disrupt morning routines, delay meeting joins, and frustrate employees trying to check urgent messages.
Microsoft has classified the issue’s scope as affecting “some users” within impacted organizations, particularly those opening Teams to view new messages. The company noted that impact varies across tenants, meaning not every organization or every user within an affected organization will necessarily notice the slowdown.
While a permanent fix is being developed, Microsoft has recommended workarounds to keep productivity moving. Affected users can switch to Microsoft Teams on the web through a browser, or use the Teams mobile app, both of which reportedly remain unaffected by the desktop client’s loading problem. These alternatives don’t fix the underlying issue but let employees stay connected until Microsoft rolls out a resolution.
In its most recent update, posted at 8:41 AM on September 4, 2026, Microsoft said its analysis of service logs and telemetry data has so far been “inconclusive.” Engineers have not yet pinpointed why the desktop client is struggling to load on some Windows machines.
Microsoft Teams Desktop Client Fails
To move the investigation forward, Microsoft is reaching out directly to a subset of impacted users, requesting client-side logs from their devices. The company expects these logs will help isolate the underlying trigger and clarify what remediation options are viable.
This is not the only Teams-related disruption Microsoft has grappled with recently. Earlier in the year, a regression in the Teams client’s build-caching system caused similar launch failures, which Microsoft resolved by reverting a faulty service update.
Separately, Windows 11 users on ARM-based devices, such as Surface Pro and Surface Laptop models, have faced Teams and Outlook launch failures tied to an August security update, an issue Microsoft has since mitigated through a Microsoft Store update.
For now, IT administrators managing Windows fleets should monitor the Microsoft 365 admin center’s service health dashboard for updates on TM1466820 and consider proactively informing staff about the web and mobile workarounds.
Microsoft has not provided an estimated resolution timeline, but its outreach for client logs suggests the investigation is entering a more targeted, evidence-gathering phase rather than a quick patch rollout.
Microsoft has introduced Project Zenith, a new developer-optimized Windows 11 experience built for a class of high-memory PCs capable of running large AI models directly on-device, marking a significant shift away from cloud-dependent AI development workflows.
Announced as a follow-up to commitments made at Build 2026, Project Zenith targets developer-class hardware equipped with at least 64 GB of unified memory and memory bandwidth exceeding 250 GB per second.
That hardware profile allows
Microsoft has introduced Project Zenith, a new developer-optimized Windows 11 experience built for a class of high-memory PCs capable of running large AI models directly on-device, marking a significant shift away from cloud-dependent AI development workflows.
Announced as a follow-up to commitments made at Build 2026, Project Zenith targets developer-class hardware equipped with at least 64 GB of unified memory and memory bandwidth exceeding 250 GB per second.
That hardware profile allows developers to run AI models with more than 30 billion parameters locally and without usage metering, reducing reliance on cloud-based token consumption during experimentation and coding tasks.
The first devices supporting Project Zenith will ship with AMD’s Ryzen AI Halo platform, with additional OEM and silicon partners expected to join in the coming months.
Rather than being a separate product, Project Zenith is a preconfigured Windows setup layered on top of ongoing baseline improvements Microsoft has been rolling out to Windows 11 throughout the year, including refinements to Search, File Explorer, and system memory efficiency. Devices running Project Zenith inherit these performance gains while adding a development-first configuration out of the box.
That configuration includes Windows Terminal and Visual Studio Code pinned to the taskbar by default, along with pre-tuned settings across File Explorer, Search, Start, and the taskbar.
File Explorer ships with file extensions, hidden files, full title-bar paths, and long-path support enabled, while distractions such as recently used file suggestions and sync provider prompts are switched off. Search and Start come with Command Palette enabled and notification clutter minimized, aiming for what Microsoft describes as a calmer, distraction-free workspace.
Ready-to-use tools (Source: Windows)
Windows Subsystem for Linux also plays a central role in the initiative. Building on last year’s open-sourcing of WSL, Microsoft has integrated WSL containers, giving developers a native way to build, run, and manage Linux containers without leaving Windows.
From a security and platform-architecture standpoint, Project Zenith devices are designed to support agentic development workloads using Microsoft’s Execution Containers (MXC), which combine OS-enforced identity controls with containment and enterprise-grade manageability for AI agents.
Microsoft frames this as essential groundwork for a computing era where autonomous agents increasingly write, test, and execute code, arguing that a secure, isolated foundation is necessary before agentic workflows can be trusted at scale in professional environments.
Microsoft positions the initiative as an economic and architectural shift in how AI-assisted development happens: offloading capable models to local hardware for routine tasks while reserving frontier cloud models for harder problems.
The company says Project Zenith is an evolving effort shaped directly by developer feedback, with hardware variety expected across OEM partners even as the core “ready-to-code” promise stays consistent.
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Microsoft has confirmed a fresh Exchange Online incident, tracked as EX1467029, causing delays for users sending and receiving email messages from external domains.
The company first acknowledged the disruption on September 4, 2026, flagging it as a service degradation issue affecting Exchange Online, one of the most widely used business email platforms in the world.
According to Microsoft’s service health updates, the outage began around 3:49 PM GMT+5:30 and has continued through multiple
Microsoft has confirmed a fresh Exchange Online incident, tracked as EX1467029, causing delays for users sending and receiving email messages from external domains.
The company first acknowledged the disruption on September 4, 2026, flagging it as a service degradation issue affecting Exchange Online, one of the most widely used business email platforms in the world.
According to Microsoft’s service health updates, the outage began around 3:49 PM GMT+5:30 and has continued through multiple status revisions issued that afternoon, with updates posted at 4:06 PM, 4:33 PM, and 5:56 PM.
Affected users have reported intermittent “Server busy” errors when attempting to communicate with recipients outside their own organization, a symptom that typically signals backend processing delays rather than a complete mail-flow failure. Microsoft has classified the event as an incident, a designation the company reserves for issues with noticeable, widespread user impact rather than isolated glitches.
In its advisories, Microsoft said its engineering teams have identified that anti-spam protections may be compounding the problem for a subset of affected accounts, effectively slowing down legitimate mail even further as filtering systems interact with the underlying fault.
The company noted it is “continuing to analyse the behaviour and review service telemetry to better understand the underlying cause and determine the most effective mitigation path,” but has not yet provided a fixed timeline for full resolution.
Notably, this is not an isolated event. Exchange Online has suffered a string of disruptions in recent months, including a major multi-day outage tracked as EX1464935 that began August 31, 2026, and caused authentication failures, mailbox search problems, and delayed message delivery across the service before Microsoft declared it fully mitigated on September 3.
That earlier incident was traced to a fault in a core authentication component shared across multiple Microsoft 365 services, requiring engineers to test and gradually roll out remediation across affected infrastructure.
The recurrence of email delivery problems within days of the previous outage’s resolution raises fresh questions about the resilience of Microsoft’s cloud email backbone, which underpins communications for millions of enterprises worldwide.
Organizations relying on Exchange Online for time-sensitive external communication, such as customer support, vendor coordination, or security alerting, may want to monitor the Microsoft 365 admin center’s Service Health dashboard directly for real-time updates tied to issue ID EX1467029.
Security teams should also be aware that prolonged mail delays can create downstream risks, including missed threat notifications, delayed multi-factor authentication emails, and backlog-related phishing attempts that exploit user confusion during outages.
Until Microsoft confirms a root cause and rollout of a permanent fix, administrators are advised to check affected mailboxes for delivery backlogs and avoid resending messages unnecessarily, as duplicate sends can further strain the recovering mail queues. Cyber Security News will continue tracking this incident as Microsoft releases further updates.
Microsoft has confirmed a known issue causing Microsoft Teams and the new Outlook for Windows to crash or fail to launch on ARM-based PCs after installing security updates released on or after August 11, 2026.
The problem traces back to the KB5121003 update, part of Microsoft’s August 2026 Patch Tuesday rollout, and specifically affects devices running on Windows-on-ARM silicon, such as the Surface Pro 11 and Surface Laptop 7.
According to an advisory Microsoft posted to the Windows releas
Microsoft has confirmed a known issue causing Microsoft Teams and the new Outlook for Windows to crash or fail to launch on ARM-based PCs after installing security updates released on or after August 11, 2026.
The problem traces back to the KB5121003 update, part of Microsoft’s August 2026 Patch Tuesday rollout, and specifically affects devices running on Windows-on-ARM silicon, such as the Surface Pro 11 and Surface Laptop 7.
According to an advisory Microsoft posted to the Windows release health dashboard on September 1, 2026, at 19:20 PT, affected users may find that Teams and the new Outlook either refuse to open at all or close unexpectedly shortly after launching.
Notably, classic Outlook, Word, Excel, and other Microsoft 365 applications remain unaffected, suggesting the fault lies within the packaged app model used by modern Store-delivered apps rather than the underlying Office suite itself.
Microsoft Teams, Outlook Fail Crash
Microsoft says the issue is most likely to surface on new or freshly imaged PCs that have not yet received recent Microsoft Store updates, pointing to a dependency conflict introduced by the security patch rather than a fundamental flaw in the apps themselves.
Community reports on Microsoft’s Q&A forums and Tech Community boards had flagged the crashes as early as mid-August, with logs pointing to AppX and MSIX packaging errors, including the error code 0x80073CFC during token generation for the Outlook package.
The affected platforms include Windows 11 version 24H2, 25H2, and the newer 26H1 release, which requires specific Arm-based silicon such as Qualcomm’s Snapdragon X2 chips. No server platforms are impacted by this issue.
While Microsoft has not disclosed the technical root cause, the company has published a temporary workaround rather than a full fix. Affected users are advised to open the Microsoft Store, navigate to Downloads, select Check for updates, and install the latest version of the Auto Super Resolution Package, specifically version 1.0.19.0 or later.
This package is typically designed to help Copilot+ PCs use AI-driven upscaling for smoother gameplay, making its connection to Outlook and Teams stability somewhat unexpected.
Microsoft has marked the issue’s status as “Mitigated” on its release health dashboard, indicating that the workaround addresses the immediate disruption while a permanent fix is still in development. The company has stated it is working to resolve the problem through a future Windows update and will share additional details once available.
For enterprise IT administrators managing fleets of Arm-based Windows devices, this incident is a reminder to verify Microsoft Store updates before deploying new security patches, particularly on freshly provisioned hardware where the packaged app dependencies have not yet synchronized.
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