Fix Outlook Gmail IMAP Sync Requiring Offline Mode Toggle
Question details
Outlook stops automatically syncing a Gmail IMAP account and only resumes when the user manually toggles Offline mode off and on.
- Product
- Outlook for Microsoft 365
- Device & OS
- not provided
- Scenario
- Attempting to maintain a continuous, automatic synchronization of Gmail emails in the Outlook desktop application without manual intervention.
- Observed behavior
- The IMAP synchronization halts unexpectedly. Users are forced to manually switch Outlook to Work Offline and then back online to force the client to fetch new emails.
Before modifying your account settings or creating a new profile, it is highly recommended to back up your current Outlook data by exporting it to a PST file to prevent accidental data loss.
Remove and Re-add Your Gmail Account
Refreshing the account configuration by completely removing and re-adding the Gmail IMAP account can resolve underlying sync cache issues.
Often, a temporary glitch in the Outlook account configuration or a recent application update can corrupt the IMAP connection parameters. Re-establishing the connection from scratch forces Outlook to authenticate and sync fresh data with Gmail.
In Outlook, click on 'File' in the top-left corner, click the 'Account Settings' button, and select 'Account Settings' from the drop-down menu.
Under the 'Email' tab, select your Gmail IMAP account and click the 'Remove' button. Confirm any prompts to proceed.
Click 'New' under the same Email tab, enter your Gmail email address, and follow the automated prompts to authenticate via Google and allow Outlook to configure your IMAP settings automatically.
Create a New Outlook Profile
If re-adding the account does not work, the Outlook profile itself may be damaged and needs to be replaced.
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Frequently Asked Questions
Will creating a new Outlook profile delete my existing emails?
No. When using an IMAP account like Gmail, your emails are safely stored on Google's servers. Creating a new profile simply forces Outlook to download a fresh copy of those emails to your computer.
How do I export my Outlook data to a PST file for backup?
In Outlook, click File > Open & Export > Import/Export. Choose 'Export to a file', select 'Outlook Data File (.pst)', and follow the prompts to select the folders you wish to back up and save the file to your device.
Why does my Gmail sync freeze until I use Offline mode?
This synchronization freeze is typically caused by corrupted local cache data, a damaged Outlook profile, or conflicting network/security settings after a recent Microsoft 365 update. Toggling Offline mode forces the client to restart its connection attempt to the IMAP server.
