Sending, receiving, and organizing email in Outlook on the web for business
Yes. A widespread Exchange Online or Outlook service issue can cause Outlook to run slowly, including slow message opening, delays sending mail, and “Outlook is retrieving information from the server.”
Check these first:
- If Microsoft 365 admin access is available, sign in to the Microsoft 365 portal and open Service health to see whether other customers are affected.
- Check for local network issues that can also cause slowness, such as problems with the proxy server, firewall, or Internet service provider.
- Make sure the latest Outlook updates are installed.
- If the issue continues in classic Outlook on Windows, run the Classic Outlook Advanced Diagnostics troubleshooter in the Get Help app. It does not work in new Outlook for Windows.
- If Outlook is integrated with Skype for Business Online, disable that integration in Lync > Tools > Options > Personal, clear the Personal information manager check boxes, then restart Outlook and Lync.
If the problem is due to a service incident, the issue should clear after Microsoft resolves the event.