Fix Outlook Cannot Send or Receive Mail After Microsoft 365 Migration
Question details
Desktop Outlook stops sending and receiving emails following an account migration from Gmail to Microsoft 365.
- Product
- Microsoft Outlook
- Device & OS
- not provided
- Scenario
- The user recently migrated their email account from Gmail to Microsoft 365 and is trying to use the Outlook desktop client to handle emails.
- Observed behavior
- The Outlook desktop client fails to send or receive messages, often because old POP or SMTP settings are still active instead of the required Exchange Autodiscover protocols.
Before changing account settings, verify that you can successfully log in to your email using Outlook on the web. This confirms your migration was successful at the server level and the issue is isolated to the desktop application.
Re-add the Email Account Using Exchange Autodiscover
Removing the old POP/SMTP configuration and re-adding the account via Exchange Autodiscover is the most effective way to restore email flow.
When migrating to Microsoft 365, older protocols like POP and SMTP may conflict with the new Exchange environment. Forcing Outlook to use Autodiscover establishes a clean, direct connection to your new servers.
Navigate to 'File' > 'Open & Export' > 'Import/Export'. Choose 'Export to a file', select 'Outlook Data File (.pst)', and back up your current emails and contacts to prevent data loss.
Go to 'File' > 'Account Settings' > 'Account Settings'. Under the 'Email' tab, select your migrated email account and click the 'Remove' button.
Click 'New' in the Account Settings window. Enter your Microsoft 365 email address, click 'Connect', and let Outlook automatically configure the settings using Exchange Autodiscover.
Create a New Outlook Profile
If removing and re-adding the account fails, the current Outlook profile might be corrupted. Creating a fresh profile can resolve underlying configuration conflicts.
Verify Mail Protocols in Microsoft 365 Admin Center
Ensure that the necessary mail protocols are enabled for the user account at the administrative level.
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Frequently Asked Questions
Why does my Outlook still try to use my old Gmail settings after migrating?
Outlook caches your previous account settings within its profile. If the original account was configured using POP or SMTP, Outlook doesn't automatically detect the switch to Microsoft 365 servers. You must manually force the update by removing the old setup and relying on Exchange Autodiscover.
Can I use POP or IMAP for Microsoft 365 instead of Exchange?
While Microsoft 365 does support POP and IMAP protocols, it is highly recommended to use Exchange Autodiscover for desktop Outlook. Exchange provides better security, real-time synchronization of calendars and contacts, and helps avoid typical send/receive errors following a migration.
Will creating a new Outlook profile delete my old emails?
No, creating a new profile does not delete your old local data files (.pst or .ost). It simply creates a fresh configuration for connecting to the server. Your old emails are safe, and you can always switch back to your old profile or import your backed-up PST files into the new profile.
