After installing Outlook's January 2018 update, some users are unable to edit signatures.
Microsoft has identified the cause as having both the Windows app store version installed as well as a "normal" version. This would be the case if you have a new computer and Office was preinstalled, then you installed your own copy of Office.
Method 1 : Uninstall Microsoft Office Desktop Apps
- Open Settings, Find Apps & features.
- Click on the Office Desktop App and select Uninstall
- A second small Uninstall dialog will open, for you to confirm.
Method 2 : Uninstall Apps Package with Powershell
If you prefer using PowerShell, follow these steps:
Open PowerShell in run as admin mode then paste:
Get-AppxProvisionedPackage -Online | where-object {$_.packagename –like "*Outlook*"} | Remove-AppxProvisionedPackage -Online
Then input below command :
Get-AppxPackage "*Outlook*" | Remove-AppxPackage
Close the PowerShell window and open it without using run as admin. Run this command:
Get-AppxPackage "*Outlook*" | Remove-AppxPackage
Method 3 : Edit the registry key
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
and
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0006F03A-0000-0000-C000-000000000046}\LocalServer32
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