I've developed an Add-in for outlook in Visual Studio. When I run it, it opens up outlook correctly but does not show the Add-in within the COM list of add-ins.

I assume it's something to do with the registry, but can't seem to find the problem. When running the application I can see it creates a registry within the HKEY_CURRENT_USER\SOFTWARE\Microsoft\VSTO path and another within HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\Outlook\Addins that contains the Manifest with the correct file path to the VSTO project.

Am I missing something?

Thank you in advance.

CodePudding user response：

It is not clear where your windows registry keys were added.

If the installer is targeting all users on 64-bit Windows, it is recommended that it includes two registry entries, one under the HKEY_LOCAL_MACHINE\Software\Microsoft and one under the HKEY_LOCAL_MACHINE\Software\WOW6432Node\Microsoft hive. This is because it's possible for users to use either 32-bit or 64-bit versions of Office on the computer.

If the Installer is targeting the current user, it doesn't need to install to the WOW6432Node because the HKEY_CURRENT_USER\Software path is shared. For more information, see 32-bit and 64-bit Application Data in the Registry.

The Deploying a VSTO Solution Using Windows Installer article describes all required steps for creating MSI installers for Office COM add-ins. Also take a look at the Registry entries for VSTO Add-ins article which explains where windows registry keys should be added for VSTO/COM add-ins.

CodePudding user response：

Answering my own question for someone facing the same issue.

Running a repair on Office fixed my issue. To my understanding it repaired some registry key mappings.