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Microsoft says some users can’t open the Teams desktop client
Winsage
September 4, 2026

Microsoft says some users can’t open the Teams desktop client

Microsoft is addressing an issue (TM1466820) causing delays or preventing some users from accessing the Microsoft Teams desktop client on Windows systems, acknowledged on Thursday at 16:45 EDT. Affected users may experience loading failures or delays of up to two minutes and are advised to use the web or mobile versions of Teams as a temporary workaround. Microsoft is analyzing service logs and telemetry data to identify the root cause and has contacted some affected users for more information. Additionally, there is a separate issue (TM1466659) affecting Mac users, preventing them from joining Teams calls and meetings, confirmed on Sunday at 08:32 EDT. Microsoft is reassessing the cause of this disruption. Earlier this year, Microsoft resolved an issue blocking some Teams Free users from chats and calls. The company also confirmed a bug causing crashes and launch failures for Teams and New Outlook users after recent Windows security updates. Furthermore, there is an ongoing Exchange Online issue affecting multiple mailboxes, resulting in "Server busy" errors and delays in email communications with external domains.
Windows 11's August update broke Teams and Outlook on Arm PCs
Winsage
September 4, 2026

Windows 11’s August update broke Teams and Outlook on Arm PCs

Microsoft has identified an issue affecting Microsoft Teams and the new Outlook for Windows on Arm-based devices, such as the Surface Pro 11 and Surface Laptop 7, following the installation of Windows security updates released on or after August 11, 2026, specifically the KB5121003 update. The affected Windows 11 versions include 24H2, 25H2, and 26H1, causing these applications to fail to launch or close unexpectedly, while classic applications like Outlook, Word, and Excel remain unaffected. The issue is more prevalent on new or freshly imaged PCs that have not received updates from the Microsoft Store. Microsoft is working on a solution to be included in a future Windows update. In the meantime, users can mitigate the issue by updating to the latest version of the Auto Super Resolution Package (version 1.0.19.0 or later) via the Microsoft Store.
Microsoft Teams, Outlook fail to launch on ARM-based Windows PCs
Winsage
September 3, 2026

Microsoft Teams, Outlook fail to launch on ARM-based Windows PCs

Microsoft is addressing an issue affecting users of Microsoft Teams and the new Outlook on ARM-based Windows devices, specifically the Surface Laptop 7 and Surface Pro 11, following updates released since the August 2026 Patch Tuesday. Users may experience crashes and launch failures after installing security updates from August 11, 2026, particularly update KB5121003. This issue primarily affects newly set up or freshly imaged PCs that lack the latest Microsoft Store updates, while classic Outlook, Word, Excel, and other applications remain unaffected. Microsoft recommends updating the Auto Super Resolution Package as a temporary workaround. A permanent fix is being developed and will be included in a future Windows update. Additionally, Microsoft has acknowledged other issues stemming from the August updates, including problems with printing and PDF exports in certain applications, and has been rolling out fixes for system crashes and gaming problems linked to peripherals with built-in RGB lighting. Customers are also advised to disregard alerts about Microsoft Defender Antivirus being disabled after the latest updates.
Microsoft accidentally admits new Outlook looks bad
Winsage
August 24, 2026

Microsoft accidentally admits new Outlook looks bad

Microsoft has introduced a new setting in Outlook on the web and Outlook for Windows that allows users to modify the interface to resemble the classic Outlook. This optional feature aims to ease the transition for users familiar with the classic version by changing visual styling, layout, typography, icons, and interactions. Feedback indicates that the transition to the new Outlook has been challenging, with users expressing frustrations about its performance and efficiency compared to the classic version. Critics have noted that the new Outlook functions as a web wrapper, raising questions about its classification as a native app. Additionally, Microsoft has disabled Mail & Calendar to encourage users to switch to the new Outlook, highlighting the difficulties in promoting this update.
Windows 11 KB5121003 update breaks Teams and Outlook on ARM devices
Winsage
August 20, 2026

Windows 11 KB5121003 update breaks Teams and Outlook on ARM devices

Following the KB5121003 Patch Tuesday update, users on ARM64 devices like Surface Laptop 7 and Surface Pro 11 are facing startup failures with Microsoft Teams and New Outlook, while traditional Win32 applications remain unaffected. Reverting to the previous update restores functionality, but recovery options have not resolved the issue. The root cause appears to be broken AppModel Runtime package states, leading to dependency issues and 0x80073CFC errors. This problem is similar to one caused by update KB5094126 earlier this year. Creating new Windows profiles offers only temporary relief, and administrators are advised to pause the deployment of KB5121003 on ARM devices until the issue is addressed.
Microsoft is killing New Outlook's notification spam, but Classic still loads emails faster on Windows
Winsage
June 27, 2026

Microsoft is killing New Outlook’s notification spam, but Classic still loads emails faster on Windows

Microsoft is introducing a feature in New Outlook that groups email notifications to reduce interruptions and notification fatigue. Users have reported that New Outlook is slower than Outlook Classic, with email opening times taking up to 30 seconds compared to just a few seconds in the Classic version. There are also reliability issues with notifications in New Outlook, which can be inconsistent or absent for connected accounts on Windows 10 and 11. Despite the planned improvements, Outlook Classic remains more efficient for managing notifications and opening emails quickly.
Users are complaining that the new Windows version of Outlook is running slowly.
Winsage
June 20, 2026

Users are complaining that the new Windows version of Outlook is running slowly.

Microsoft has introduced two versions of Outlook in Windows 11: Outlook Classic (a Win32 desktop application) and the New Outlook. Users have reported significant performance issues with the New Outlook, noting a lag of approximately 10 seconds for tasks that Outlook Classic performs instantly. The New Outlook operates on WebView2, which involves multiple processes and higher memory consumption, while Outlook Classic runs as a single process. Microsoft is aware of these performance challenges and is testing a new API called 'Delayed Message Timing' to address them. Users find Outlook Classic to be more reliable and faster, particularly for businesses that need efficient notification processing.
silver Android smartphone
Winsage
June 19, 2026

Microsoft’s new Outlook now supports offline email attachments

Microsoft is transitioning users from the traditional Outlook app for Windows 11 to a newer web-based version. The latest update allows users to add email attachments while offline, with emails being sent automatically once the device reconnects to the internet. This feature has been in testing since October 2025 and is now rolling out to a broader audience. Despite these enhancements, many users still prefer the classic Outlook app or the web version.
Microsoft's new Outlook takes 10 seconds to do what Outlook Classic does instantly on Windows
Winsage
June 16, 2026

Microsoft’s new Outlook takes 10 seconds to do what Outlook Classic does instantly on Windows

Microsoft's Outlook for Windows is facing criticism for its notification handling, particularly in the new Outlook version built on the WebView2 framework. Users experience a delay of approximately 10 seconds when clicking on email notifications, compared to the near-instantaneous access provided by Outlook Classic, which allows users to open new emails in about five seconds. The new Outlook consumes significantly more memory and CPU resources, using between 490 MB and 636 MB of RAM, while Outlook Classic operates within 117 MB to 148 MB. Despite updates aimed at improving the new Outlook, the core issue of notification handling remains unresolved. Microsoft is working on enhancements, but the performance limitations of the WebView2 architecture continue to affect user experience. Outlook Classic will continue to be supported until April 2029.
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