[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 resize them or make other adjustments. German blog readers has confirmed this behavior. Details may be found at my German article [use build-in translation to read the text].
[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 with Microsoft 365 mailboxes to me. This time, the EWS migration planned for Exchange Online starting at the end of 2026 has already cast its shadow. Microsoft rolled out its code change on March 27, 2026, which affects Veeam Backup and leads to errors.
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 Outlook Classic: E-Mail senden scheitert mit 0x80070005-0x0004dc-0x000524 [use build in translation to read the article in your language].
[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 will end in October 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 It is intended to resolve the issues caused by the withdrawn Windows 11 Preview Update KB5079391.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 have received and reader comments, the new update appears to have additional issues.
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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 be included in the regular security update on April 14, 2024. Due to installation issues, the update has been temporarily withdrawn. Details may be read here [use build in translation to read the article in English].
On March 24, 2026, I warned of two critical vulnerabilities in the Citrix products mentioned in the post Critical vulnerabilities in Citrix NetScaler ADC and Gateway (March 2026). Now attacks exploiting one of these vulnerabilities are being observed in the wild. Users should patch immediately—details are available in the article Kritische Schwachstellen in Citrix Netscaler ADC und Gateway (März 2026) [use build in translation to read the article in English].
Microsoft released the Preview Update KB5079391 for Windows 11 24H2–25H2 on March 25, 2026. They continue to work on fixes and improvements for various components (including a fix for the ERROR_BAD_PATHNAME update error) and update the AI bloatware. Here is an overview of the new features Microsoft has included in the Preview Update.
[German]There is an issue with Outlook Classic where the client crashes on startup due to a faulty Microsoft Teams Meeting add-in. As far as I know, Microsoft is still investigating this problem. Below, I have compiled some workarounds for those affected so that Outlook Classic can be used again.
[German]Microsoft has already released a hotfix update on March 23, 2026, for users of Windows 11 Enterprise LTSC 2024. This update is intended to resolve sign-in issues with Microsoft accounts caused by update KB5079473 from March 10, 2026. It is likely the hotfix counterpart to the out-of-band update KB5085516.
MVP:
2013 – 2016
WIMVP:
2017 – 2020
