Microsoft is deprecating TLS 1.0 and 1.1 in Exchange Online, with rejection of these legacy protocols set to begin in July. Organisations using outdated mail clients or unpatched devices must upgrade urgently to avoid disruption. Persisting with old TLS versions exposes email communications to modern threats and compliance issues. IT teams should audit all connecting services and devices, ensuring they support TLS 1.2 or above. Testing upgraded connections before the enforcement date is recommended.
This move reflects a broader industry drive towards improved cryptographic standards. The inconvenience of upgrading is outweighed by the severe security risks posed by outdated protocols. Maintaining up-to-date configurations is now critical for organisational security.
Microsoft Exchange Online Deprecates TLS 1.0 and 1.1: Urgent Action Required for Organisations
