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OneDrive / SharePoint Backup Fails with "Error: Invalid MIME content-length header encountered on read."

KB ID: 4808
Product: Veeam Backup for Microsoft 365 | 8 | 8.1 | 8.2
Published: 2025-12-18
Last Modified: 2026-05-20
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Challenge

A backup job for OneDrive or SharePoint items processed by Veeam Backup for Microsoft 365  fails when attempting to download certain item versions, displaying the following error:

Invalid MIME content-length header encountered on read

Cause

The issue is related to the download process used by the product when handling certain items.

Solution

Customers experiencing this error are advised to upgrade to the latest version of Veeam Backup for Microsoft 365.

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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