MC1155427 - Legacy TLS cipher suites will be deprecated in M365 services on October 20, 2025 | Microsoft 365 Message Center Archive Microsoft 365 will deprecate legacy TLS cipher suites lacking forward secrecy on October 20, 2025, supporting only specified TLS 1.3 and 1.2 cipher suites. Organizations must update systems and…

Day 2 of #ITAdvent. Months ago #Microsoft posted #MC1155427 indicating #Microsoft365 will deprecate legacy #TLS #cipher suites lacking forward secrecy from October 20, 2025. Especially old devices or software might have issues. See more: mc.merill.net/message/MC11...