Microsoft also is advising customers who rely on the on-premises version of Exchange to move to the 2019 version as soon as possible. Microsoft will support Exchange Server until October 14, 2025.

Updated: A new critical vulnerability impacting Exchange Server is being exploited in the wild.

Microsoft removes the August Exchange Server security update after admins complain it disabled their server installations.

The Exchange Server Subscription Edition is now generally available. On Tuesday, Microsoft released the successor to the last locally installable Exchange Server 2019.

For Exchange Server SE, Microsoft explained, in addition to purchasing the required Server licenses and CALs, customers must also maintain an active subscription.