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Email item data export from EWS failed

KB ID: 4867
Product: Veeam Data Cloud for Microsoft 365
Veeam Backup for Microsoft 365
Published: 2026-06-03
Last Modified: 2026-06-03
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Challenge

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.

Cause

The root cause of this issue is currently under investigation.

This article will be updated as more information becomes available.

Solution

Workaround

Some customers have reported success after completing the following steps:

  1. Follow the steps in How to Temporarily Disable Exchange Web Services Throttling to temporarily disable EWS throttling for the affected organization.
  2. Once throttling has been disabled, run the affected Exchange Online backup jobs again.

More Information

If the errors persist after following the steps in KB4198, create a Microsoft support case and grant Microsoft approval to work directly with Veeam to investigate the issue. When opening a Veeam Technical Support case, include your Microsoft Support case number.

If this KB article did not resolve your issue or you need further assistance with Veeam software, please create a Veeam Support Case.

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