Microsoft Postpones Exchange Server SE CU1 Release Amid Security Focus

Microsoft has delayed the release of Exchange Server SE CU1, citing an increased focus on security updates and vulnerability remediation efforts.

The company had originally expected to release CU1 by the end of the first half of 2026 but has now pushed the timeline back indefinitely.

Moving forward, Microsoft recommends that organizations continue deploying monthly Exchange SE security updates, which provide the strongest protection until CU1 is released.