Exchange Online outage causes email delays, 'Server busy' errors
Microsoft is working to resolve an ongoing Exchange Online outage that is delaying email sent to and received from external domains.
By Dillip Chowdary • Sep 06, 2026 • Source: BleepingComputer
What happened
BleepingComputer reports: Exchange Online outage causes email delays, 'Server busy' errors. Microsoft is working to resolve an ongoing Exchange Online outage that is delaying email sent to and received from external domains. [...]
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How it works
Read the original coverage at BleepingComputer via the source link above for the complete details and primary quotes.
Who is affected
Cross-check release notes and official docs before changing production systems based on early reporting.
Developer Action Items
- ☐ Diff the official changelog for Microsoft before you bump — APIs, defaults, and removed flags only.
- ☐ Install through the vendor's documented channel in staging; keep a one-command rollback and time-box the canary.
- ☐ Grep your repo for old flag names, lockfile pins, and plugin versions that the notes mark as breaking.
- ☐ Prefer the first patch cut over the day-zero tag unless you have a reason to be on the leading edge.
- ☐ If BleepingComputer did not name a region, plan, or SKU, screenshot the official availability line before you promise it to users.
Author
Dillip Chowdary
Writes Tech Bytes coverage of AI, engineering, and the tools that actually ship. Editor of Tech Pulse Daily.
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