Mail (microsoft outlook 2016) application not found

When migrating a customer to Office 365 I had a problem opening the mail control panel applet. It simply showed the error message “Application not found”:

Error message when trying to run the mail applet from Microsoft Outlook 2016 "Application not found"

This seemed to be occurring on 64-Bit machines where we had installed 32-Bit Office 2016 from the Office 365 portal.

I found two workarounds for this:

Workaround One: Run the mail applet directly from the command line

  1. Press Windows Key + R to bring up the run dialog
  2. Paste the following:
    C:\Program Files (x86)\Microsoft Office\root\Office16\MLCFG32.CPL

Workaround Two: Run the mail applet from Outlook 2016

If you in Outlook you can run the control panel mail applet from within Outlook by going to File and clicking on account settings, at the bottom of the account settings drop down you should see a “Manage Profiles” button, which will take you into the mail applet.
Manage mail profiles from within Outlook 2016

I would like to find a proper solution for why this is happening, so if anyone comes across a solution, I’d appreciate it if you share your solution.

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