Category Archives: Update

Exchange Server security updates February 2026

Posted on 2026-02-11 by guenni

Microsoft released the "February 2026" security update for Exchange Server on February 10, 2026. The security update applies to Exchange Server 2016, Exchange Server 2019, and Exchange Server Subscription Edition (SE). Exchange Online customers are already protected and are not … Continue reading →

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Microsoft Security Update Summary (February 10, 2026)

Posted on 2026-02-11 by guenni

On February 10, 2026, Microsoft released security updates for Windows clients and servers, Office, and other products. The security updates address 54 vulnerabilities (CVEs), eight of which are critical, six of which were classified as zero-day vulnerabilities, and one of … Continue reading →

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Patchday: Windows 10/11 Updates (February 10, 2026)

Posted on 2026-02-11 by guenni

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 →

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Microsoft Office 0-day vulnerability CVE-2026-21509; Emergency updates available

Posted on 2026-01-27 by guenni

Microsoft Office 2016 to 2024 and Office 365 apps contain a zero-day vulnerability (CVE-2026-21509) that is being actively exploited in attacks. On January 26, 2026, Microsoft published initial information (also about mitigations) and emergency updates for Microsoft Office.

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Windows 11 24H2-25H2 Update KB5074109: Uninstall fails with error 0x800f0905

Posted on 2026-01-25 by guenni

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 →

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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 ...

Windows: Out-of-Band updates fixes Outlook freezes (Jan. 24, 2026)

Posted on 2026-01-25 by guenni

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 →

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Windows 11 24H2/25H2: Citrix Director / Remote Assist fails with update KB5074109

Posted on 2026-01-16 by guenni

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 →

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Windows Server: Out-of-Band Updates for WSUS vulnerability CVE-2025-59287 (Oct. 23, 2025)

Posted on 2025-10-24 by guenni

[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 →

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Windows file preview broken with Oct. 2025 update: Microsoft explains why it's by design – Part 2

Posted on 2025-10-24 by guenni

[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 →

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Windows: File preview in Explorer broken after October 2025 update – Part 1

Posted on 2025-10-23 by guenni

[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 →

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