I wrote an Outlook Addin a while back and I'm trying to see if it still works
in Outlook 2003. In can't remember exactly how I got this installed in
Outlook in the past, I think I used the registry keys for an Exchange client
extension. Now I'm looking to register it in a newer fashion, maybe an ECF
file. Is that how addins are supposed to be installed/registered? Can
someone point me to docs regarding this and potentially any samples?

By the way, this is not an Exchange extension as I implement the Office
extensibility interface (IDTExtensibility2).
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Thanks,
Nick