Ok, so some people might be saying about poor Staska here, "what an idiot, he didn't read the warning!"

But what about my case? I was merging contacts (something I have had to do several times on my N900), and I accidentally hit an unrelated contact's name (easy to do when you are trying to scroll the list).

Boom, the two unrelated contacts were merged! Fused! Bonded!

Ok, so just un-merge them, right? Wrong! There's no "un-merge" button!

Ok, so just delete the incorrect fields from one of the contacts!

"Warning: Contacts will be deleted from server!"

Yikes! Help!

So I agree with Staska. There's some serious problems here. Definitely not consumer-ready.