M365 Message Center

Geändert

29.01.2026

Services

Windows

The January 2026 non-security preview update is now available for Windows 11, versions 25H2 and 24H2. Information about the contents of this update is available from the release notes, which are accessible from the Windows 11 update history page. To learn more about the different types of monthly quality updates, see Windows monthly updates explained.Looking to explore upcoming features and improvements in Windows 11? Check out the Windows roadmap. It includes what’s coming to the Windows Insider Program, what’s gradually rolling out, and what’s generally available.Highlights for the Windows 11, version 25H2 update: The Settings Agent now supports more languages, with expanded support for German, Portuguese, Spanish, Korean, Japanese, Hindi, Italian, and Chinese (Simplified).*This update expands the functionality of Cross‑Device Resume. You can continue activities from your Android phone

Geändert

28.01.2026

Handlung bis

31.01.2027

Services

Microsoft Defender XDR

Updated January 26, 2026: We have updated the content. Thank you for your patience. [Introduction] We’re retiring the Microsoft Defender for Endpoint (MDE) Advanced Hunting API and Microsoft Defender XDR Advanced Hunting API and transitioning customers to the Microsoft Graph Security API. This update aligns our security integrations with a unified interface and schema across Microsoft Defender products. The Microsoft Graph Security API provides broader data coverage, improved consistency, and better scalability for automation and security workflows. [When this will happen] Retirement start: February 6, 2026 Full retirement: February 1, 2027 After February 1, 2027, the MDE and XDR APIs will no longer function. [How this affects your organization] Who is affected: Organizations using the MDE or XDR Advanced Hunting API for automation, integration, or custom workflows.You are receiving this

Geändert

28.01.2026

Services

Windows

IMPORTANT: This notice is only relevant for environments where:Microsoft Office is usedScan Cab is used to check for update complianceThe January 2026 Scan Cab was deployed before 2:30 PM PT on January 27, 2026.An updated version of the January 2026 Scan Cab was made available at 2:30 PM PT on January 27, 2026. This Scan Cab includes new metadata corresponding to new updates for Microsoft Office 2016.The new security updates for Microsoft Office released January 26, 2026, included additional protections to address CVE-2026-21509. Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally. See the additional information section of this message for details.How this affects your organization:IT administrators who downloaded the Scan Cab before 2:30 PM PT on January 27, 2026, should re-acquire and re-deploy it

Geändert

26.01.2026

Services

Windows

(Updated 1/26 to adjust Windows Server entries and links)Microsoft released today a resolution for an issue observed after installing the January 2026 Windows security update. This issue may cause applications that open or save files stored in cloud‑backed locations to become unresponsive or display errors. Some installations of Outlook may also become unresponsive and fail to open when PST files are stored in cloud‑backed storage such as OneDrive. An out-of-band (OOB) update was released today, January 24, 2026, to address this issue. This cumulative update includes all protections and improvements from the January 2026 Windows security update released January 13, 2026, as well as from the OOB update released on January 17, 2026 (which introduced fixes for two known issues: remote desktop connections and hibernation failures). This OOB update is available through Windows Update for Wind

Geändert

21.01.2026

Services

Windows

Mark your calendars for February 5, 2026. Windows engineering teams will be hosting a second Ask Microsoft Anything (AMA) on the Microsoft Tech Community to help you get the information you need about updating Secure Boot certificates on your Windows devices before they start expiring in June 2026. Experts will be on camera and in the chat to help you with update scenarios, inventorying your estate, formulating the right deployment plan for your organization, and more. When will this happen:This one-hour AMA event will start at 8:00 AM PST (3:00 PM UTC) on February 5, 2026. What you need to do to prepare:Visit the event page, then select Add to Calendar. Want an event reminder? Log in to the Tech Community and select Attend. Can’t attend at that time? Scroll to the bottom of the event page, then post your questions early where it says “Comment.” The event will be recorded so you can catc

Geändert

17.01.2026

Services

Windows

Microsoft has identified issues upon installing the January 2026 Windows security update. To address these issues, an out-of-band (OOB) update was released today, January 17, 2026.Connection and authentication failures in remote connection applications: This issue affects multiple platforms including Windows 11, version 25H2; Windows 10, version 22H2 ESU; and Windows Server 2025. See the bottom of this message for the complete list of affected products.Devices with Secure Launch might fail to shut down or hibernate: This issue only affects Windows 11, version 23H2.The out-of-band (OOB) update was released today, January 17, 2026, in the Microsoft Update Catalog. If you have not yet deployed the January 2026 Windows security update and your IT environment includes the affected applications and features, we recommend applying this OOB update instead. For more information and installation i