Some users may be unable to send Exchange Online email Tuesday 18th July 2023 09:49:00
- This issue should now be resolved.
- From MS: "We’ve identified that a change to the free/busy infrastructure resulted in impact to the Exchange online mail flow infrastructure. We’re identifying a plan to mitigate impact and restore mail flow."
- Affected users may receive the following error "503 5.5.1 bad sequence of commands"
