Exchange Online Backup Failures (Forbidden Errors)
Identified - 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
Apr 01, 2026 - 17:07 UTC
Reports Operational
Central India Operational
Usage & Metering Operational
Central India Operational
Web Portal Operational
Central India Operational
REST API Operational
Central India Operational
Office 365 Operational
Central India Operational
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance

Scheduled Maintenance

Weekly Scheduled maintenance May 5, 2026 20:00-21:30 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 May 02, 2026 - 08:02 UTC
May 2, 2026

No incidents reported today.

May 1, 2026

No incidents reported.

Apr 30, 2026

No incidents reported.

Apr 29, 2026

No incidents reported.

Apr 28, 2026
Weekly Scheduled maintenance
Completed - The scheduled maintenance has been completed.
Apr 28, 21:30 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Apr 28, 20:00 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.
Apr 25, 08:02 UTC
Apr 27, 2026

No incidents reported.

Apr 26, 2026

No incidents reported.

Apr 25, 2026

No incidents reported.

Apr 24, 2026

No incidents reported.

Apr 23, 2026

No incidents reported.

Apr 22, 2026

No incidents reported.

Apr 21, 2026
Weekly Scheduled maintenance
Completed - The scheduled maintenance has been completed.
Apr 21, 21:00 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Apr 21, 20:00 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.
Apr 18, 08:02 UTC
Degraded backup performance
Resolved - This incident has been resolved.
Apr 21, 07:35 UTC
Monitoring - A fix has been implemented and we are monitoring the results.
Apr 10, 01:38 UTC
Investigating - We are currently experiencing degraded backup performance that may affect backup SLAs for some customers. Our engineering team is actively investigating the root cause and taking steps to resolve the issue as quickly as possible.
Apr 9, 13:18 UTC
Apr 20, 2026

No incidents reported.

Apr 19, 2026

No incidents reported.

Apr 18, 2026

No incidents reported.

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