Microsoft · The Register
Legacy TLS tour continues with Exchange Online blocking old versions from July 2026
Compiled by KHAO Editorial — aggregated from 1 outlet. See llms.txt for citation guidance.
◌ Single Source
Microsoft has warned users still clinging to legacy TLS versions that the end is nigh for TLS 1.0 and 1.1 on POP3 and IMAP4 connections to Exchange Online.
Key facts
- Support for TLS 1.0 and 1.1 in Exchange Online ended in 2020
- Transport Layer Security (TLS) dates back decades. 1.0 was published in 1999, and 1.1 in 2006
- Microsoft has warned users still clinging to legacy TLS versions that the end is nigh for TLS 1.0 and 1.1 on POP3 and IMAP4 connections to Exchange Online
- Google Workspace still supports TLS 1.0 and 1.1, according to its documentation, although it would be prudent for users to select a more recent protocol, assuming that their client supports it
Summary
Redmond warned, "We will start to block legacy version connections starting in July 2026." The move is long overdue, and the Windows giant has been warning users for years that it was coming. It was, however, much an opt-in thing, and in July 2026, the time will run out. Transport Layer Security (TLS) dates back decades. 1.0 was published in 1999, and 1.1 in 2006.