M365 Service Health Notification

Exchange Online service alert Incident information Title: On-Premise Cloud Cache (OPCC) users served on affected infrastructure can't sync with the Outlook mobile app ID: EX218694 Status Service Degradation Details Title: On-Premise Cloud Cache (OPCC) users served on affected infrastructure can't sync with the Outlook mobile app User Impact: Users may be unable to sync messages with the Outlook mobile app if the mailbox is hosted on-premises. Current status: We've identified a recent update exposed a code regression that is causing the Sent Items folder for On-Premise Cloud Cache (OPCC) users to grow inorganically, resulting in the mailbox reaching the quota limit and users being unable to sync in the Outlook mobile app. We halted the update to prevent further impact, and we're working on a fix intended to relieve syncs and mitigate impact. Scope of impact: This issue only impacts users hosted on infrastructure where the regression was deployed. All other users would not be impacted. Start time: Thursday, July 9, 2020, at 8:00 PM UTC Root cause: A recent update exposed a code regression that is causing the Sent Items folder for On-Premise Cloud Cache (OPCC) users to grow inorganically, resulting in the mailbox reaching the quota limit and users being unable to sync in the Outlook mobile app. Next update by: Friday, July 17, 2020, at 8:00 PM UTC Thank you, The Microsoft team To customize what's included in this email, who gets it, or to unsubscribe, set your Service health preferences. If you are receiving this email because your Admin added you as a recipient, please contact your Admin to unsubscribe. Microsoft respects your privacy. Review our online Privacy Statement. Microsoft Corporation One Microsoft Way Redmond, WA USA 98052