Got pulled into a strange #MicrosoftExchange issue. One of two new Exchange SE servers was returning HTTP 503 (Service unavailable) errors for Remote Mailboxes while it worked fine for On-Premises Mailboxes. And even for Remote Mailboxes it sometimes worked. Putting it into #maintenancemode and rebooting it solved the issues for now. I am only wondering if they will come back. No root cause discovered yet. Second server didn't show the error and kept providing the results. #weirdfriday issues