"Mailbox is not fully configured" Error During Exchange Backup
| KB ID: | 4787 |
| Product: |
Veeam Data Cloud
for Microsoft 365 Veeam Backup for Microsoft 365 |
| Published: | 2025-10-21 |
| Last Modified: | 2025-11-05 |
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Challenge
A backup job may fail when processing Archive Mailbox objects with the following error:
Processing archive mailbox: username@organization.com failed with error: Mailbox is not fully configured.
Solution
- This issue was resolved in Veeam Backup for Microsoft 365 8.2 P20251031 (build 8.2.0.2202) available from KB4751.
Critical Note: After updating Veeam Backup for Microsoft 365, you must upgrade all proxies. - As of 2025-11-01 this issue is resolved for all customers using Veeam Data Cloud for Microsoft 365. For more information, please review https://vdcstatus.veeam.com/.
Updates
- 2025-11-06
A fix is now available for Veeam Backup for Microsoft 365 8.2 via KB4751. This issue is now fixed in Veeam Backup for Microsoft 365 build 8.2.0.2202. - 2025-11-01
A patch has been deployed for Veeam Data Cloud for Microsoft 365, and this issue is now fixed for all customers using Veeam Data Cloud for Microsoft 365. - 2025-10-24
- An updated release of Veeam Backup for Microsoft 365 8.1.2, containing a fix for this issue, is now available via KB4711.
- Veeam RND is working on a fix for Veeam Backup for Microsoft 365 8.2.
- 2025-10-23
The root cause has been identified, and we are finalizing a solution. We appreciate your patience as we work to resolve this issue as quickly as possible.
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