

But, if you are using a 64-bit version of Windows, the subkey under HKEY_LOCAL_MACHINE will vary depending on the bitness of your Office installation. More informationĬOM add-ins register themselves in the Windows Registry under either the HKEY_CURRENT_USER or HKEY_LOCAL_MACHINE hives. If you are not modifying the correct registry data (because you do not realize you are running 32-bit Office on a 64-bit version of Windows), then your changes will not change the add-in behavior. This is important to remember if you are troubleshooting problems in your Office programs and you need to disable add-ins.

HKEY_LOCAL_MACHINE\software\Wow6432Node\microsoft\office\Outlook\Addins
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If you have a 32-bit version of Office installed on a 64-bit version of Windows, add-ins that are registered under HKEY_LOCAL_MACHINE will be registered under the \Wow6432Node subkey.
