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Learn how to install, reinstall, or activate microsoft 365 or office 2024 on a pc or mac. Sep 3, 2025microsoft defender and purview suites for business premium: Dec 17, 2025welcome to the special edition of what's new in microsoft 365 copilot for both november and december 2025!

Oct 14, 2025this out-of-band hotpatch update for windows 11, version 25h2 and 24h2 (kb5078167), improves functionality, performance, and reliability.