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Exchange Online backup jobs in Veeam Backup for Microsoft 365 and Veeam Data Cloud for Microsoft 365 may fail to process mailboxes, returning one of the following errors: Processing mailbox <mailbox@company.com> failed with error: Email item data export from EWS failed (item IDs: [...]). The operation has timed out. Or: The server cannot service this request right now. Try again later.
This issue occurs when an Exchange Web Services (EWS) export operation takes longer to complete than the default timeout allows. Exporting very large mailbox items or encountering EWS throttling can prolong the operation past the timeout, causing the backup job to fail.
For Veeam Data Cloud for Microsoft 365 A fix has been deployed to the environment. No action is needed from Veeam Data Cloud for Microsoft 365 customers. For Veeam Backup for Microsoft 365 A fix has been included with Veeam Backup for Microsoft 365 8.5.
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