Yearly Archives: 2026

Adobe Reader: Emergency patch for 0-day vulnerability CVE-2026-34621

[German]A few hours ago, I reported on a zero-day vulnerability in Adobe Reader. Simply opening a PDF file can be enough to take control of the system. Adobe has now confirmed the vulnerability (CVE-2026-34621) and released a security update to … Continue reading

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MC1269861: Deleted OneDrive files do not always go to the Recycle Bin

[German]Another update from April 3, 2026, affecting Microsoft OneDrive users. On that date, Microsoft announced that starting in May 2026, files deleted from the OneDrive cloud will no longer appear in the local Recycle Bin. However, recovery via the OneDrive … Continue reading

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Malware: Website hosting CPUID, HWMonitor, CPU-Z, etc., hacked

[German]Warning to users who use tools such as CPUID, HWMonitor, CPU-Z, etc. and updated it recently (between April 9, and April 10, 2026. The website where these tools were hosted and offered for download has fallen victim to a supply … Continue reading

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Microsoft 365: Semi-Annual Enterprise Channel (SAEC) is being discontinued

[German]A quick note for administrators of Microsoft 365 installations who have placed their users in the Semi-Annual Enterprise Channel (SAEC). This channel will be merged with the Monthly Enterprise Channel (MEC). Users will therefore be subjected to the flood of … 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 11 25H2 Pro: Update KB5085516 is causing issues

[German]I received a report from a reader stating that the KB5085516 update for Windows 11 25H2 Pro is causing issues on the Windows desktop for this user. This affects how windows are displayed on the desktop, making it impossible to … Continue reading

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Veeam Backup Issue with MS 365 Mailboxes due to the EWS retirement in March 2026

[German]A quick note to blog readers who use Veeam Backup 365. Back in November 2025, there were already issues with the integration between Veeam Backup and Microsoft 365 mailboxes. Now, a reader has once again reported the Veeam Backup issue … Continue reading

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Outlook Classic: Email sending issue resolved

There was an issue sending emails in Outlook Classic when using a mailbox on outlook.com. This caused the operation to trigger an NDR error 0x80070005-0x0004dc-0x000524. The issue has since been resolved. I have added this information to the German post … Continue reading

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Microsoft is now pushing the Windows 11 25H2 upgrade

[German]Unmanaged systems running Windows 11 24H2 Home and Pro are now being gradually updated to Windows 11 25H2. Microsoft announced this on March 27, 2026. The reason for this move is that support for Windows 11 24H2 Home and Pro … Continue reading

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Windows 11 24H2 – 25H2: OOB Preview Update KB5086672 with issues (March 31, 2026)

[German]On March 31, 2026, Microsoft released the Preview Update KB5086672 as an out-of-band update for Windows 11 24H2–25H2. It is intended to resolve the issues caused by the withdrawn Windows 11 Preview Update KB5079391. However, based on the information I … Continue reading

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Windows 11 24H2 – 25H2: Rollout of Update KB5079391 suspended

Microsoft has suspended the rollout of the update package KB5079391, which was released on March 26, 2026, as a preview update for Windows 11 24H2–25H2. This update was intended to fix a long list of bugs and is scheduled to … Continue reading

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