Using classic Outlook for Windows in business environments
According to the latest update, the Microsoft 365 team is continuing to work on improving server stability and restoring normal service. Unfortunately, a confirmed timeline for full service restoration has not yet been provided.
If you have Microsoft 365 administrator privileges, please sign in to the Microsoft 365 Admin Center using this link to view the details of this issue.
If you are an end user, you can check the Microsoft 365 Service Status for the latest service availability updates.
Please note that this is a user-to-user support forum, so we do not have direct access to Microsoft's internal systems or additional information about the restoration timeline. The official channels above are the best places to check for the latest updates.