Microsoft blames AI for delayed Exchange update, can’t say when it will arrive
Dealing with machine-made bug backlog makes it hard to find a moment to deliver promised subscription service
Microsoft has explained the delay in releasing a major update for its Exchange Server Subscription Edition (SE) by attributing it to the additional work required for AI-assisted bug-finding. In a recent post, the company admitted that it had underestimated the time needed to validate, reproduce, fix, and test the reported issues.
Exchange SE is the subscription version of Microsoft's email server, and Cumulative Updates (CUs) are released once or twice a year, containing all recent bug fixes and other changes. Microsoft had previously stated that CU1 would be released by the end of the first half of 2026, but now says it does not have a date to provide. The company emphasizes its commitment to security and the need to avoid publishing a CU with further security updates, which could burden Exchange administrators.
The team is continuing to work on CU1, aiming to release it when a stable point is reached and there is a month without pressing security payloads.
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