Windows 11 / Server 2025 will continue to support old printer drivers

Drucker[German]A brief update on a topic that caused quite a stir here on the blog in early February 2026, but was then quietly resolved by Microsoft on February 25, 2026. The issue was that Microsoft will be using Mopria printer drivers in Windows 11 and subsequent OS versions in the future. However, Windows 11 will continue to support older drivers.

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Vulnerabilities (CVE-2025-59536, CVE-2026-21852) in Anthropic Claude Code

Sicherheit (Pexels, allgemeine Nutzung)[German]Security researchers at Check Point Research have identified critical vulnerabilities (CVE-2025-59536, CVE-2026-21852) in Anthropic's AI-based coding tool "Claude Code." These vulnerabilities allowed remote code execution and the theft of API credentials. This is critical because attackers could abuse built-in mechanisms such as hooks, Model Context Protocol (MCP) integrations, and environment variables. Attackers could execute arbitrary shell commands and exfiltrate API keys when developers cloned and opened untrusted projects. Beyond launching the tool, no further action was required by the user.

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MC1179154: Microsoft Authenticator locks itself when jailbreak/root access is used

Sicherheit (Pexels, allgemeine Nutzung)[German]A quick note for people who use the Microsoft Authenticator app on an iPhone or Android device. Microsoft has announced that, as of February 24, 2026, it will first warn and then block EntraID logins on devices with jailbreak (iOS) or root access (Android) and finally delete the data. This change will be implemented gradually and is expected to be completed by mid-2026.

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Microsoft 365 Local and Azure Local available

[German]Microsoft started to offer Microsoft 365 Local to customers who operate an Azure Local infrastructure. This is a scenario in which the Office 365 apps run on the local Azure structure. It's a strategy to hold up the move to digital sovereignty in Europe.

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Firefox 148.0 with AI killswitch; Firefox 115.33.0 ESR as last update for Windows 7

Mozilla[German]A few days ago, I reported that Mozilla Firefox 115 ESR would be discontinued on Windows 7/8.1. Now, Firefox 115.33.0 ESR has been released as the last update for these operating systems. Mozilla has also released Firefox 148.0 with AI Killswitch. And there is an update to Firefox 140.8 ESR.

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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 ...


Identify EWS apps and their use prior to EWS shutdown

Exchange LogoMicrosoft is retiring Exchange Web Services (EWS). This process will begin in October 2026 and end with the complete shutdown of EWS in 2027. I recently mentioned this in the German blog post Exchange Online: Zeitplan für das Ende von EWS veröffentlicht (use the translate feature of my German blog). Microsoft has now published a post on how administrators of Exchange Online tenants can identify apps that use EWS and solve the issue.

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European cloud provider Hetzner raises prices; blame AI

[German]European cloud provider Hetzner is currently informing customers about a price increase for its cloud packages. This is justified by price increases for RAM, SSD, etc., as a result of the AI hype. Here are the details about this topic.

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Mail delivery issues on Microsoft servers (hotmail etc.)? Feb. 25, 2026

Mail[German]A quick note to readers who use Microsoft email accounts. A reader informed me this morning that there are massive delivery problems to Hotmail addresses. There is also a second reader report in the discussion area asking about email problems at Microsoft. Microsoft is receiving an increasing number of reports of problems from administrators. Anyone affected?

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Outlook Classic: Bug hides mouse pointer (also in other MS 365 apps)

[German]Outlook Classic users are once again plagued by a silly bug that Microsoft has built into the software. The bug causes the mouse pointer to disappear unintentionally. It can also affect OneNote or other MS 365 apps. Microsoft has finally confirmed the bug.

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Outlook New: Microsoft extends opt-out period for companies until 2027

[German]The option for companies to defer use of the Outlook New app to Outlook Classic was originally scheduled to end in April 2026. Microsoft has now postponed this date by 12 months to March 2027.

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