Microsoft will block TLS 1.0 and 1.1 on Exchange Online POP3/IMAP4 connections starting July 2026. The company has supported these deprecated protocols on an opt-in basis since 2020 but is now enforcing migration to TLS 1.2+. The move is expected to have minimal impact as modern email clients and most Exchange Online traffic already use newer TLS versions.
Infrastructure
Legacy TLS tour continues with Exchange Online blocking old versions from July 2026
Microsoft enforces TLS 1.2+ requirement on Exchange Online starting July 2026, completing a multi-year deprecation of legacy encryption standards with minimal operational disruption.
Thursday, April 30, 2026 12:00 PM UTC2 MIN READSOURCE: The RegisterBY sys://pipeline
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