The connection to the incoming (IMAP) server was dropped. Please check the incoming (IMAP) server settings and try again.

Use the following checks and fixes for the IMAP connection drop during Outlook setup:

1. Verify IMAP server name and port
   • Ensure the correct IMAP server name and port are used, as provided by the email service provider.
   • For Outlook for Android/iOS, an “Invalid IMAP Server Info” error indicates the server name or port is wrong and must match the provider’s documented IMAP settings.
   • If the account is Gmail, confirm these values in Outlook:
     • Incoming (IMAP) server: imap.gmail.com
       • Requires SSL: Yes
       • Port: 993
     • Outgoing (SMTP) server: smtp.gmail.com
       • Requires SSL: Yes
       • Requires TLS: Yes (if available)
       • Requires Authentication: Yes
       • Port for SSL: 465
       • Port for TLS/STARTTLS: 587
2. Confirm IMAP is enabled on the mailbox
   • For Gmail accounts, IMAP must be enabled in Gmail before Outlook can connect:
     1. Go to Gmail.com in a browser.
     2. Open Settings > Forwarding and POP/IMAP.
     3. Under IMAP Access, select Enable IMAP.
     4. Select Save Changes.
   • For other providers, verify IMAP is enabled in the provider’s web settings.
3. Fix Outlook.com-specific IMAP connection issues (if using Outlook.com mailbox)
   • If the Outlook.com account is configured as IMAP in multiple clients, Outlook.com may block the connection:
     1. Go to account.live.com/activity and sign in with the affected account.
     2. Under Recent activity, find the event matching the time of the IMAP error.
     3. Expand it and select This was me to authorize the IMAP connection.
     4. Retry connecting from Outlook.
   • If Outlook.com is used to access a ******@outlook.com/@hotmail.com/@live.com domain and IMAP will not sync, remove the connected IMAP account in Outlook.com and reconfigure it as POP, following the POP settings from the email provider.
4. Address TLS-related connection termination (Windows/Outlook desktop)
   • If the IMAP/POP server connection is “unexpectedly terminated” or “interrupted” on Windows, and TLS 1.3 is enabled in the system registry, Outlook may fail to sync:
     1. In the registry under Protocols, check if TLS 1.3 exists.
     2. Export the Protocols key (backup) before changes.
     3. Delete the TLS 1.3 key and its subkeys.
     4. Restart Outlook; if sync still fails, restart Windows.
5. Re-run Outlook profile setup
   • If configuration is still stuck or failing, clear the local Outlook state/profile and re-add the account so Outlook can prompt again for server details and credentials, then re-enter the correct IMAP/SMTP settings from the provider.

If the issue persists after these steps, contact the email service provider to confirm the exact IMAP/SMTP server names, ports, SSL/TLS requirements, and whether IMAP access is allowed for the account.

References:

• Error: Invalid IMAP Server Info
• Fix problems connecting your Google account to the Microsoft Cloud
• POP, IMAP, and SMTP settings for Outlook.com
• Outlook IMAP or POP server unexpectedly terminated the connection, and the server was interrupted
• New Outlook has stopped working, Fails when starting after 30 to 60 seconds - Microsoft Q&A