Users may experience errors or failures when accessing their mailbox from Exchange Online connection methods

Title: Users may experience errors or failures when accessing their mailbox from Exchange Online connection methods User impact: Users may experience errors or failures when accessing their mailbox from Exchange Online connection methods. Current status: Our automated service monitoring has identified that users may be experiencing errors or failures that are preventing access to their mailbox from all Exchange Online connection methods. We're further analyzing a subset of Exchange Online service infrastructure to determine our next steps for remediating the impact. Scope of impact: This issue may prevent users in the United Kingdom from accessing their mailboxes from Exchange Online connection methods. Start time: Tuesday, September 22, 2026, at 5:00 PM UTC Next update by: Tuesday, September 22, 2026, at 8:30 PM UTC

Title: Potential issues accessing mailboxes via one or more connection methods User impact: Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods. Current status: We're investigating a potential issue and checking for impact to your organization. We'll provide an update within 60 minutes.