tls 1 0 and tls 1 1

The tag covers Microsoft's deprecation of TLS 1.0 and TLS 1.1, focusing on the upcoming Exchange Online POP/IMAP legacy TLS cutoff scheduled for July 2026. Discussions center on identifying non-human mail clients such as older gateways, scanners, archival tools, and line-of-business applications that still rely on these outdated protocols. The primary task for administrators is to inventory all such clients, verify TLS 1.2 or later support, and reconfigure, replace, or retire any that cannot be updated. The tag emphasizes proactive migration to avoid service disruption, treating legacy TLS-dependent appliances as already failing.