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- Microsoft Publisher will no longer be supported after October 2026
Support for the perpetual version of Publisher will end on October 1, 2026, when Office LTSC 2021 reaches end of support Microsoft 365 subscribers will not be able to access Publisher from that date forward
- End of support for legacy Outlook for Mac - Microsoft Support
Starting October 2026, the legacy Outlook for Mac client will stop working against Exchange Online mailboxes This transition marks a significant step towards a more robust, feature-rich, and secure email experience for all users
- Excel calendar templates - Microsoft Support
Download pre-built Excel calendar templates Stay organized with a variety of Excel calendar layouts and templates you can easily adapt to your needs
- SharePoint Alerts retirement - Microsoft Support
The option to create new Alerts will be blocked (from July 2025, for new tenants, from January 2026, for existing tenants) Users trying to create a new Alert will not be able to save the Alert plus they’ll see a banner to make them aware of the SharePoint Alerts feature is retiring
- Windows Secure Boot certificate expiration and CA updates
You may need to take action to ensure that your Windows device remains secure when the certificates expire in 2026 Both UEFI Secure Boot DB and KEK need to be updated with the corresponding new 2023 certificate versions
- Publisher help learning
In October 2026, Microsoft Publisher will reach its end of support After that time, it will no longer be included in Microsoft 365 and existing on-premises suites will no longer be supported
- September 9, 2025—KB5065426 (OS Build 26100. 6584)
Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026 This might affect the ability of certain personal and business devices to boot securely if not updated in time
- KB5071844: Safe OS Dynamic Update for Windows 11, version 24H2 and 25H2 . . .
Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026 This might affect the ability of certain personal and business devices to boot securely if not updated in time To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance For details and
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