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Deprecation of TLS 1.0 and TLS 1.1 for Exchange Online POP3/IMAP4 access

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Microsoft will fully deprecate support for legacy TLS versions 1.0 and 1.1 for POP3 and IMAP4 connections to Exchange Online starting July 2026, requiring TLS 1.2 or later for continued access. The change aims to mitigate risks associated with outdated cryptographic protocols that no longer meet modern security standards. Most users are expected to remain unaffected as current traffic predominantly uses TLS 1.2 or higher, but organizations relying on legacy endpoints or non-compliant clients may face connectivity failures or require updates to custom/embedded systems.

Timeline

  1. 28.04.2026 16:18 1 articles · 2h ago

    Legacy TLS 1.0/1.1 deprecation enforced for Exchange Online POP3/IMAP4 access

    Microsoft will block TLS 1.0 and TLS 1.1 for POP3 and IMAP4 connections to Exchange Online starting July 2026, requiring TLS 1.2 or higher. Connections using outdated protocols will fail, and users with legacy clients or embedded systems must update to avoid disruptions.

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