It deleted some of my smilies. It doesn't display some other smilies. My avatars are messed up: the ones that came from pictures that have since been deleted or moved are gone. Suddenly there's a picture of me and my ex in the list again (can I sue Microsoft for emotional damage?
).
Most functions have only become harder, like changing your avatar or searching for those smilies you rarely use. I bet it comes with a load of new useless crap.
But I guess I'll try to adapt to it instead of going back to something else again... dam you Microsoft.