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Category Archives: Windows
Patchday: Windows 10/11 Updates (February 10, 2026)
On February 10, 2026 (the second Tuesday of the month, Microsoft's patch day), Microsoft released cumulative updates for the still-supported client operating system versions of Windows 10 (with ESU license) and Windows 11. Here are some details about these updates, … Continue reading
Windows 11 24H2-25H2 Update KB5074109: Uninstall fails with error 0x800f0905
The security updates for Windows released on January 13, 2026 are causing major problems, and Microsoft has had to release corrective updates. In the case of crashes in apps and Outlook Classic, uninstallation was even recommended. This is unfortunate for … Continue reading
Posted in issue, Update, Windows
Tagged issue, Patchday 1.2026, Update, Windows 11
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Windows: Out-of-Band updates fixes Outlook freezes (Jan. 24, 2026)
There are various issues caused by the security updates for Windows released on January 13, 2026. Among other things, issues with Outlook Classic when retrieving POP mail or program freezes have been reported. On January 24, 2026, Microsoft released out-of-band … Continue reading
Windows 11 24H2/25H2: Citrix Director / Remote Assist fails with update KB5074109
Brief information for administrators of Citrix Virtual Desktop environments. I received several reports, that after installing security update KB5074109 from January 13, 2025, for Windows 11 24H2 or 25H2, Citrix Director failed to work. The reason is, that Microsoft Remote … Continue reading
Posted in issue, Security, Update, Windows
Tagged Citrix Director, issue, Update, Windows
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Windows 11 25H2: Umlaut bug affecting Azure OneDrive users
[German]A German user pointed out a major umlaut bug in OneDrive that is causing problems for Azure users. Clients running Windows 11 25H2 cannot access OneDrive if the Azure username in the profile contains an umlaut.
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 ...
Windows Server: Out-of-Band Updates for WSUS vulnerability CVE-2025-59287 (Oct. 23, 2025)
[German]There are out-of-band updates (e.g., KB5070883 for Windows Server 2019) that Microsoft released on October 23, 2025. The purpose of these emergency updates is to close a critical vulnerability in WSUS. The remote execution vulnerability CVE-2025-59287 has been rated with … Continue reading
Windows file preview broken with Oct. 2025 update: Microsoft explains why it's by design – Part 2
[German]The security updates for Windows released on October 14, 2025 cause the preview of files (e.g., PDF documents or Office documents) in Explorer to be blocked in some cases. I described the problem in Part 1. On October 22, 2025, … Continue reading
Windows: File preview in Explorer broken after October 2025 update – Part 1
[German]Die Oktober 2025-Updates für Windows scheinen einen negativen Effekt auf die Vorschau von Dateien im Explorer zu haben. Mir liegen Berichte vor, dass PDF-Dokumente oder andere Dokumentdateien nicht mehr in der Vorschau geöffnet werden – speziell, wenn sie auf Netzwerkfreigaben … Continue reading
Windows 11 24H2-25/H2, Server 2025: SID duplicates cause NTLM/Kerberos authentication errors
[German]On October 21, 2025, Microsoft issued a statement regarding a problem with NTLM/Kerberos authentication. Authentication errors occur in these operating systems when SIDs are identical on multiple computers and certain updates from August or September 2025 are installed. This is … Continue reading
Windows 11 24H2-25H2: Out-of-band Recovery Update KB5070762
[German]Microsoft has released an out-of-band recovery update KB5070762 for Windows 11 24H2 and Windows 25H2 on October 20, 2025. This update is intended to update the Win PE environment and fix the issue caused by the October 2025 patch day, … Continue reading