How does Microsoft Outlook and the Apple Macintosh OSX contact manager do it?
If y'all export your personal vCard or interesting addresses from your own contact list, especially if you have IM addresses in them, and email them to me at email@example.com, so I can pick them apart, I'd appreciate it.
Update: I was just sent a link to RFC4770, "vCard Extensions for Instant Messaging". Cool! Of course, do Apple and Microsoft actually honor it?