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Title: Some users may experience issues accessing mailboxes via one or more connection methods in Exchange Online
User impact: Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods.
Current status: We've identified a possible configuration change that may be causing impact and are reviewing this change to confirm this theory and to identify a mitigation plan.
Scope of impact: This issue impacts internal Microsoft users only attempting to access their mailboxes via one or more connection methods in Exchange Online.
Next update by: Thursday, October 2, 2025, at 3:30 PM UTC
Title: Some users may experience issues accessing mailboxes via one or more connection methods in Exchange Online
User impact: Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods.
Current status: We're reviewing service monitoring telemetry to isolate the source of the issue and establish a fix.
Scope of impact: This issue impacts internal Microsoft users only attempting to access their mailboxes via one or more connection methods in Exchange Online.
Next update by: Thursday, October 2, 2025, at 10:30 AM 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.
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