Exchange Online Backup Failures (Forbidden Errors)
Identified - Description: We are tracking reports of "Forbidden" errors during Office 365 backups caused by a recent Microsoft Exchange Online behavior change. This affects specific tenants and mailboxes using EWS.

Exchange Online jobs may show User Mailboxes reporting a Mailbox Status of:
Throttling from Exchange, Failed to process mailbox due to [The request failed. Forbidden]

Resolution:
Additional information and steps to resolve this can be found here, https://support.commvault.com/Article/Details/KA-191556
Jun 22, 2026 - 12:36 UTC

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Scheduled Maintenance

Weekly Scheduled maintenance Aug 5, 2026 07:00-08:30 UTC

We will be doing quick maintenance to ensure the best experience for our customers.We will be back shortly and operations that were in progress will immediately resume.
Posted on Aug 02, 2026 - 08:02 UTC

Aug 4, 2026

No incidents reported today.

Aug 3, 2026

No incidents reported.

Aug 2, 2026

No incidents reported.

Aug 1, 2026

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Jul 31, 2026

No incidents reported.

Jul 30, 2026

No incidents reported.

Jul 29, 2026

Weekly Scheduled maintenance
Completed - The scheduled maintenance has been completed.
Jul 29, 08:30 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jul 29, 07:00 UTC
Scheduled - We will be doing quick maintenance to ensure the best experience for our customers.We will be back shortly and operations that were in progress will immediately resume.
Jul 26, 08:02 UTC

Jul 28, 2026

No incidents reported.

Jul 27, 2026

No incidents reported.

Jul 26, 2026

No incidents reported.

Jul 25, 2026

No incidents reported.

Jul 24, 2026

No incidents reported.

Jul 23, 2026

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Jul 22, 2026

Weekly Scheduled maintenance
Completed - The scheduled maintenance has been completed.
Jul 22, 08:30 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jul 22, 07:00 UTC
Scheduled - We will be doing quick maintenance to ensure the best experience for our customers.We will be back shortly and operations that were in progress will immediately resume.
Jul 19, 08:02 UTC

Jul 21, 2026

No incidents reported.

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