Microsoft Outlook (2019, 2021, 365): Unable to connect to Exchange Online mailboxes

Posted on 2026-03-19 by guenni

[German]A quick question for users and administrators who are still using Microsoft Outlook 2019 (support for Office 2019 expired in October 2025). I've received a report that it's currently no longer possible to connect to Exchange Online mailboxes. There have also been reports that Outlook 2021 and Outlook 2024 LTSC—and possibly Outlook 365 as well—may be affected. However, there is a workaround that seems to be helping those affected.

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Restructuring at Microsoft's Copilot division; forced Copilot app installation halted

Posted on 2026-03-18 by guenni

Copilot[German]At Microsoft, the restructuring and reorganization of its AI division continues. Mustafa Suleyman is no longer directly responsible for the Copilot division. And Microsoft has apparently put a temporary halt to its attempt to roll out Copilot across all areas by hook or by crook. The company is now focusing on paying Copilot customers and reducing the forced integration of Copilot in other areas. Below is an overview of the current situation.

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Outlook classic: Microsoft fixes accented and extended characters question mark bug

Posted on 2026-03-17 by guenni

[German]Since late January/early February 2026, users have been complaining that Outlook can no longer recognize umlauts and displays them as question marks. Microsoft appears to have recently fixed this issue in Outlook.

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Windows 11 Enterprise LTSC 2024: Hotpatch Update KB508489 for Bluetooth

Posted on 2026-03-17 by guenni

Windows[German]A brief note for administrators who have Windows 11 Enterprise LTSC 2024 in their environment. On March 16, 2026, Microsoft released an out-of-band (OOB) update, KB508489, as a hotpatch for this operating system. This update is intended to resolve issues in the Bluetooth stack of the Long-Term Servicing Channel (LTSC) version of Windows 11 Enterprise LTSC 2024.

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Outlook Classic: Microsoft investigates Sync and Connect issues

Posted on 2026-03-16 by guenni

[German]Microsoft has confirmed two issues with Microsoft Outlook Classic that are currently under investigation. One issue involves a failed connection to Exchange servers when creating groups. The other issue concerns the synchronization of Outlook clients after a password has been changed for Gmail and Yahoo accounts.

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Why ISL Online: Critical factors when choosing a remote desktop solution

[Sponsored Post]In the rapidly evolving IT world, choosing the right remote desktop software is critical for organizations that value security, ease of use and reliability. One provider of secure remote access that has been on the market since 2001 is ISL Online, which presents some considerations for choosing such software below. More ...

HP EliteBook 660 G11: Why was BIOS v. 1.08.01 pulled?

Posted on 2026-03-15 by guenni

[German]A blog reader contacted me last week to ask whether BIOS version 1.08.01 for the HP EliteBook 660 G11 had been withdrawn. The revocation of the BIOS version has been confirmed by third parties. However, there is no information about what might have happened (only speculation that Samsung memory caused blue screens).

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Windows 11 24H2-25H2: Hotpatch KB5084597 closes vulnerabilities

Posted on 2026-03-14 by guenni

Windows[German]Microsoft has unexpectedly released an emergency update (hotfix) for Windows 11 24H2 and 25H2 on March 13, 2026. This security update is intended to address a security issue in the RRAS management tool (Windows Routing and Remote Access Service). As far as I can tell, it is only available via the Hotpatch channel.

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Exchange Online: Permission change on "Public Folders" is denied

Posted on 2026-03-13 by guenni

Exchange Logo[German]A question for all Exchange Online tenant administrators. Are you currently still able to set or change permissions for public folders? A blog reader contacted me because he's been having trouble with his tenant for the past few days—he can't make any changes to permissions. The reader reported that this issue has now also affected some of his clients' tenants.

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Windows 11 25H2: Autoinstall of preview update KB5077241, update GPO from Microsoft changed?

Posted on 2026-03-13 by guenni

Windows[German]Quick question for blog readers who use Windows 11 24H2 or 25H2 and install preview updates. A blog reader contacted me this a couple of days ago, because various updates, which are normally optional, were installed automatically on his computer. Upon checking, he noticed that the value for the "Optional Updates" group policy had been changed.

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Patchday: Microsoft Office Updates (March 10 2026)

Posted on 2026-03-12 by guenni

Update[German]On March 10, 2026 (the second Tuesday of the month, Microsoft Patch Day), Microsoft released several security updates for Microsoft Office. This month, serious vulnerabilities in Excel were fixed (see also the blog post Microsoft Security Update Summary (March 10, 2026)). Below are a few information about the available updates.

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