Investigating - 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]
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
Jul 19, 2026 - 08:02 UTC
Resolved -
We have continued to closely monitor operations throughout the weekend and can confirm that system performance has remained stable. Job processing has returned to and is continuing at normal levels, with no further issues observed. We will maintain enhanced monitoring as a precaution, but at this time the incident is considered resolved.
Jul 19, 13:17 UTC
Monitoring -
We have deployed corrective fixes to address the issue affecting certain VM and OneDrive backups and are actively monitoring system performance to ensure service stability and continued improvement. While backup performance is recovering, some customers may still experience intermittent delays or longer-than-normal backup durations as the environment stabilizes.
Our teams remain closely engaged and are monitoring the effectiveness of these changes while continuing to validate system health across impacted services. We appreciate your patience and understanding as we work to fully restore normal service levels and will provide additional updates as needed.
Jul 17, 15:10 UTC
Update -
We have identified an issue affecting certain VM and OneDrive backups and continue to actively work with our engineering teams on mitigation efforts. Customers may still experience degraded backup performance and longer-than-normal backup durations while we address the identified issue and work toward restoring normal service levels.
Our teams remain engaged and are monitoring the situation closely as mitigation activities continue. We appreciate your patience and understanding and will provide additional updates as more information becomes available.
Jul 17, 02:37 UTC
Identified -
We have identified an issue affecting certain VM and Onedrive backups. This issue is impacting backup performance and we are actively working with our engineering teams to restore normal service levels as quickly as possible. Customers may continue to experience longer-than-normal backup durations while mitigation efforts are underway.
We appreciate your patience and understanding as we work to fully resolve this issue. We will continue to provide updates as more information becomes available.
Jul 16, 16:59 UTC
Completed -
The scheduled maintenance has been completed.
Jul 15, 04:30 UTC
In progress -
Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jul 15, 03:00 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 12, 08:02 UTC
Completed -
The scheduled maintenance has been completed.
Jul 8, 04:30 UTC
In progress -
Scheduled maintenance is currently in progress. We will provide updates as necessary.
Jul 8, 03:00 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 5, 08:01 UTC