After updating from Windows 7 to Windows 10 I kept getting the following message from User Account Control every time I opened Outlook 2013:
“Do you want to allow this app to make changes to your device?”
The fix was to locate OUTLOOK.EXE.
In my case it was in “C:\Program Files (x86)\Microsoft Office\Office15”.
Right click on the file and choose “Troubleshoot compatibility” -> “Try recommended settings”.
This suggested “Windows compatibility mode: Windows 8”.
Click “Test the program…” to launch Outlook with these settings.
Now click “Yes, save these settings for this program”.
User Account Control no longer pops up whenever I open Outlook.