"Microsoft warned, 'We will start to block legacy version connections starting in July 2026.' Support for TLS 1.0 and 1.1 in Exchange Online ended in 2020, and the company has been alerting users about this change for years."
"Transport Layer Security (TLS) dates back decades. 1.0 was published in 1999, and 1.1 in 2006. Both were deprecated in 2021, and Microsoft stated that they 'are no longer considered secure.'"
"Microsoft expects minimal impact from the change. The company wrote, 'Modern email clients and libraries already support TLS 1.2 or higher.'"
Microsoft has announced that it will begin blocking TLS 1.0 and 1.1 connections for POP3 and IMAP4 to Exchange Online in July 2026. Support for these legacy protocols ended in 2020, and while many clients still use them, Microsoft has provided an opt-in endpoint for continued use. The company emphasizes that modern email clients support TLS 1.2 or higher, and expects minimal impact from this change. Google Workspace still supports older TLS versions, but users are encouraged to upgrade to more secure protocols.
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