Windows 10: Outlook is already running. Please close the other window to continue

Last few days having problem opening Outlook not 365. Getting message "outlook is already running. please to close the other window to continue".Have to go to Task Manager - Processes to end task. After that can open Outlook. How to fix it?Thanks

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Sporadic: Outlook 2019 not closing

Fergus, See OUTLOOK.EXE continues running after you exit Outlook - Slipstick I found other suggestions but thought Slipstick would be the most reliable outlook 2019 not closing properly at DuckDuckGo I tried to find a TenForums thread on the subject but could not even though I thought it was the subject of several threads a year or two ago. Best of luck, Denis

 

How to install outlook express on windows xp with explorer 8?

This is an awkward problem to solve and one I don't think is worth the time and effort.

The OP would be better off either using a modern webmail service like gmail or outlook.com or using a modern email client like Windows Live Mail like FX-GMC suggested or Thunderbird from Mozilla. If nothing else, Outlook Distress was notorious for corrupting its data files and losing all your email in one easy step. Not worth it.

 

Outlook 2016 problems

As suggested by Appleoddity, the first step is to disable all your add-ins to determine whether the issue is caused by a problematic add-in.

If issue still continues when all add-ins are disabled, then you can try renaming the following \Outlook registry key to \Outlook-1 when Outlook is closed:

Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook

Then, start Outlook and create your new profile to test it. When you start Outlook in safe mode, most of the customization settings are disabled, and these customization settings are stored in the \Outlook registry key. If it doesn't work, you can just renaming the newly generated \Outlook key to \Outlook-2, and then rename the \Outlook-1 key back to \Outlook.