How to fix Outlook's working offline issue?

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If Outlook working offline even after you have deactivated Work Offline mode, there is most likely an issue with your Outlook configuration. The following are some of the possible causes:
Outlook is unable to connect to your email server (either because your Internet connection is unreliable or because it is incorrectly configured);
The credentials you used to log in to your email account are incorrect;
It's possible that your Outlook profile is corrupt; try establishing a new Outlook profile to see if it resolves the issue.
Outlook may be staying offline due to a third-party Outlook add-in. You may use our Add-ins Management Tool to enable/disable add-ins and figure out which one is causing the offline mode issue (available for free in Bells & Whistles for Outlook – among other things).