Linked cards in Contacts?

The Linked Contacts do not seem to appear in my wife's 3GS, yet they appeared in my 3G before I upgraded to the 4. I did a restore on her 3GS and still nothing. Why is that?

Tap on it to be taken to a similar card. E.g., for one coworker, it takes me to the same card in MobileMe, and also an apparent mistake, where I imported the card into Unfiled, didn’t see it, and imported again into the right folder. I probably should delete the unfiled one, but I don’t yet trust iOS4 sync.

Anyone find a URL with an explanation for what "Linked Cards" actually are?

It seems to only be available with Gmail's exchange service. I currently use my University's exchange server mail and didn't see the option until I added my Gmail account as an exchange account to see whole it handled syncing contacts on with two accounts. Or maybe it only shows up if you have two exchange accounts that you are syncing contacts with??

As Connie Hawkins already asked:
"Anyone find a URL with an explanation for what "Linked Cards" actually are?"

I've seen the feature, but have no idea what it should do.
Now a colleague has synced with MobileMe and Outlook and got all address book entries with linked cards to the same entry in MobileMe and Outlook.

I'm doing the same sync with MobileMe and Outlook and do not have a single linked card.

I still do not know what linked cards are for, but I've found this post that eplains how to remove the duplicates.

http://discussions.apple.com/thread.jspa?messageID=12038399&#12038399

Okay I still don't get how this is helpful, especially as it seems when I installed the latest OS it's really buggered up all my contacts. Some are on the iphone but not in exchange, some on exchange not in iphone, many single contacts have duplicate phone numbers, addresses. This seems like the only value is basically putting contacts in catergories. (e.g. golf friends, business friends, relatives etc. and sorting them.)

I still can't figure out how to get a contact that was in my contacts and is now only on the iphone back to exchange? I called Apple Support and was shoveled up to level 2 and he said he "wasn't very well versed in Linked Cards" so would have to investigate and get back to me. That was suppose to happen today and nothing. He said he hoped he wouldn't have to throw it up to an engineer as it may take some time to get back to me????

This all seems like a good idea gone bad. Wish they gave us the option to link or not.

You're absolutely right. It showed up after I added an Exchange acount and it is available for every card now. The linking feature is only available with multiple services, i.e Gmail account and Exchange account on the same device.