After uninstalling the Windows store app Microsoft Office Desktop Apps, the Signature or Stationery and Fonts button should work.
Open Settings, Find Apps & features.
Click on the Office Desktop App and select Uninstall
change both (Default) and LocalServer32 values in each of the following keys to the appropriate path for your installation of Outlook.
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{0006F03A-0000-0000-C000-000000000046}\LocalServer32
This one may not be in your registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0006F03A-0000-0000-C000-000000000046}\LocalServer32
Default installation paths for Office / Outlook are:
Outlook 2016 Subscriptions & Retail Licenses 64-bit:
C:\Program Files\Microsoft Office 16\root\office16\Outlook.exe
Attachment Processor for Outlook
Outlook 2016 Subscriptions & Retail Licenses 32-bit:
C:\Program Files (x86)\Microsoft Office 16\root\office16\Outlook.exe
Outlook 2016 ProPlus (volume license) 64-bit:
C:\Program Files\Microsoft Office\Office16\Outlook.exe
Outlook 2016 ProPlus (volume license) 32-bit:
C:\Program Files (x86)\Microsoft Office\Office16\Outlook.exe
Outlook 2013 Subscriptions & Retail Licenses 64-bit:
C:\Program Files\Microsoft Office 15\root\office15\Outlook.exe
Outlook 2013 Subscriptions & Retail Licenses 32-bit:
C:\Program Files (x86)\Microsoft Office 15\root\office15\Outlook.exe
Outlook 2013 ProPlus (volume license) 64-bit:
C:\Program Files\Microsoft Office\Office15\Outlook.exe
Outlook 2013 ProPlus (volume license) 32-bit:
C:\Program Files (x86)\Microsoft Office\Office15\Outlook.exe
Outlook 2010:
C:\Program Files (x86)\Microsoft Office\Office14\Outlook.exe
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