tls 1.0 tls 1.1

Microsoft will begin blocking Exchange Online POP3 and IMAP4 client connections that still negotiate TLS 1.0 or TLS 1.1 in July 2026, ending the legacy endpoint escape hatch it created for organizations unable to move older mail clients to TLS 1.2 or newer. The decision is less a surprise than a...

Microsoft’s latest Exchange Online security announcement is a reminder that “legacy” does not always mean unused. POP3 and IMAP4 may no longer be the preferred way most Microsoft 365 users access their mailboxes, but they remain embedded in help desk tools, monitoring systems, ticketing...