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I am running Outlook 2010 (64bit). Every task in my To-Do list is duplicated. If I 'complete' one task, the second copy also marks as complete. If I flag an email to be added to the task list, 2 copies are listed.

I only have a single email profile configured on the laptop. I have tried adding an addition email profile, and that seemed to resolve the problem, but only until I closed Outlook and relaunched.

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How are you viewing your Tasks - via the Task List in the To Do bar? In the To-Do List area or the Task folder itself? Are you syncing your tasks with a mobile device (or anything else for that matter)? – wizlog Nov 11 '11 at 13:42
The Tasks are not being sync with a mobile device. Everywhere within Outlook that I can view the Tasks/To-Do list they are listed twice. This include the Mail tab & the Tasks tab. – DavidGrove Nov 11 '11 at 13:56

Are you using Outlook with GMail over IMAP? If so then it's because Gmail’s IMAP shows the same item in multiple folders. This causes the tasks in your To-Do bar to be shown more than once.

You can fix the problem using the instructions here.

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If the duplication shows in the To-Do Bar or To-Do List but not in your Tasks folder itself, then try resetting the To-Do Bar via;

Windows XP Start-> Run; outlook.exe /resettodobar (note the space in the command

Windows Vista and Windows 7 Start-> type; outlook.exe /resettodobar (note the space in the command)

If you see duplicates in the Tasks folder, make sure you are not seeing these duplicates because of a view settings.See Tasks show up multiple times

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This is a Brand new install of Outlook 2010, on a fresh install of Windows 7. From the initial launch of Outlook 2010 the Items in the To-Do list are duplicated. On my 'old' laptop with Outlook 2007 installed I only see a single instance of each task. This has to be an Outlook 2010 setting. – DavidGrove Nov 11 '11 at 14:33
I don't know what causes the problem, just that you have it. Did you follow the instructions in my answer (note: I just fixed some formatting, if it didn't work, it should now). – wizlog Nov 11 '11 at 14:38
Yes sir, I followed your commands, and read/followed the suggestions on the site the you listed. Problem continues. Is it possible that Outlook2010 is reading data from both the Server & a local copy of data? – DavidGrove Nov 11 '11 at 14:49

It's worth checking to see if your auto-archive is causing the duplication, check within your Tasks to see if you have Tasks duplicated (should see a different Task list for each .PST)

You would also get it if you had imported an old PST into your current and then selected to open the old PST as a seperate folder file, effectively duplicating your data.

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