Office 365 is a complex cloud-based service and has reputation for it's stability, with it going down occasionally.

Step-by-step guide

This guide is a general guide on where to look to validate whether Office 365 is experiencing issues or not.

1. Check Reddit; are other users report issues to these subreddits?
   1. https://www.reddit.com/r/sysadmin/
   2. https://www.reddit.com/r/Office365/
2. Check Twitter; are other people reporting similar issues?
   
   1. The Official Microsoft 365 outage account: https://twitter.com/MSFT365Status
   2. Search query: https://twitter.com/search?q=%40MSFT365Status&f=live
3. Check the official Microsoft Service Health Status locations; these locations - if they contain an outage will generally given you more complete information including IDs, status details and affected services.
   1. https://status.office365.com/
   2. https://portal.office.com/adminportal/home#/servicehealth - Note this page will obviously only work, if Microsoft 365 admin center is operational

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