Using classic Outlook for Windows in business environments
Since Outlook shows Connected to Microsoft Exchange and All folders are up to date, the next checks are the mailbox and service side rather than basic connectivity.
- Confirm whether mail arrives in Outlook on the web
Try the same mailbox in Outlook on the web.- If messages appear there, the issue is likely with the Outlook desktop client.
- If messages do not appear there either, the issue is more likely with the mailbox, Exchange Online service, or tenant configuration.
- Check whether more than one user is affected
Since test emails between accounts in the same organization are not being received, check whether this affects multiple users.- If multiple users are affected, an admin should check Microsoft 365 Service health status under Exchange Online.
- Run Outlook client repair steps
Two common causes of send/receive problems are out-of-date software and a corrupted Outlook profile.- Run Windows Update to make sure Outlook and Windows are fully updated.
- Run the Support and Recovery Assistant for Microsoft 365 to diagnose common Outlook connectivity issues.
- If the issue is only in classic Outlook, verify Outlook is not effectively offline
In classic Outlook, check the status bar at the bottom. If it shows Disconnected, Working Offline, or Trying to connect..., go to Send/Receive on the ribbon and select Work Offline to toggle back online, then try Send/Receive again. - If Outlook on the web also fails, have an admin verify the mailbox state
For a business account that fails in both browser and app, the accepted guidance is to verify in the Microsoft 365 Admin Center that the user has an active Exchange Online mailbox and that the Exchange license is assigned correctly. - Escalate if mailbox and service checks do not resolve it
If Outlook on the web also does not receive mail and the mailbox/license look correct, the next step is to contact Microsoft support through the admin support path for business products.