Email, Messaging, & Video Calls Email Prevent Outlook from Displaying Duplicate Gmail Tasks How to use filters to avoid duplicate Gmail tasks in Outlook Share Pin Email Print Email Gmail Yahoo! Mail By Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated January 21, 2020 If your Gmail email is set up in Outlook using IMAP and you flag emails in Outlook or star emails in Gmail, you may have duplicate items in your Outlook To-Do tasks list. These duplicates occur because Gmail displays the task in several folders such as All Mail and the Inbox. Outlook doesn't recognize these emails as being the same and shows multiple instances of the same task. Here's how to avoid duplicating tasks. Instructions in this article apply to Outlook 2019, 2016, 2013, 2010; and Outlook for Office 365. Make sure the To-Do Bar is visible in Outlook Enable the To-Do Bar in Outlook before fixing the duplicate tasks. Go to the View tab and select To-Do Bar > Tasks. In the Tasks pane, select Arrange by > View Settings. In the Advanced View Settings: To-Do List dialog box, select Filter. In the Filter dialog box, select the Advanced tab. In the Define more criteria section, select Field > All Mail fields > In Folder. In the Value text box, enter All Mail, then select Add to List. The new filter appears in the Find items that match these criteria section. Select OK. In the Advanced View Settings dialog box, select OK. Duplicate tasks are removed from the Task pane.