Outage in Veeam Data Cloud

M365 - "Mailbox is not fully configured" Error During Exchange Backup

Resolved Minor
October 22, 2025 - Started about 2 months ago - Lasted 9 days

Incident Report

We have identified an issue that is causing Exchange backup failures for some customers, with an error message of "Mailbox is not fully configured." Veeam's team is working with Microsoft to remediate the issue. An update will be provided when it's resolved.

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Latest Updates ( sorted recent to last )
MONITORING about 2 months ago - at 10/27/2025 08:41PM

The root cause has been identified with the solution ready to be rolled out. This solution will be distributed within the maintenance cycles preliminary scheduled this week (you may track here "https://vdcstatus.veeam.com/incidents/01k88t9py9mqq6r5vzpm5s3e3v": https://vdcstatus.veeam.com/incidents/01K88T9PY9MQQ6R5VZPM5S3E3V)

IDENTIFIED about 2 months ago - at 10/24/2025 12:48PM

The root cause has been identified and we are finalizing a solution. We appreciate your patience as we work to resolve this issue as soon as possible.

INVESTIGATING about 2 months ago - at 10/22/2025 05:05PM

We have identified an issue that is causing Exchange backup failures for some customers, with an error message of "Mailbox is not fully configured." Veeam's team is working with Microsoft to remediate the issue. An update will be provided when it's resolved.

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