The days are truly numbered for legacy encryption protocols in Exchange Online as Microsoft initiates the deprecation of TLS 1.0 and 1.1. Rejection of these legacy Transport Layer Security versions will begin in July, meaning organisations still relying on outdated mail clients or unpatched multifunction devices have only a short window to prepare.
TLS 1.0 and 1.1 have long outstayed their welcome. Persisting with these protocols exposes organisations to contemporary cryptographic threats and invites compliance concerns and security breaches. Microsoft’s action reflects a wider industry push to strengthen email security, a domain frequently targeted by attackers.
IT teams should first audit every service, device, and client connecting to Exchange Online, including legacy scanners, out-of-date Outlook installations, and custom integrations. Upgrading to TLS 1.2 or above is essential as older protocols will no longer be permitted. It’s critical to ensure all operating systems and applications are compatible with TLS 1.2 or 1.3. Validating these connections in a test environment prior to enforcement is strongly advised, as assumptions around compliance can lead to disruption.
This deprecation forms part of a broader industry shift towards improved cryptographic standards. Reliance on the adage “if it isn’t broken, don’t fix it” no longer suffices in the current security landscape. Organisations yet to modernise their configurations should treat this as a priority.
The inconvenience of upgrading is undeniable, but the hazards of continuing with legacy security protocols are far more serious. Keeping configurations current is essential as security challenges continually evolve.
Original source: The Register.
