Hey righter I gambled this morning and upgraded to 9.0. Before doing so I copied and saved my archives to my desktop in hope of putting them back if indeed I did lose them after the upgrade. Well good news...I upgraded and did not lose a thing! Every single one of my archives were still there.

I also have no problem at all connecting now.

I am loving the new 9.0 messenger and it's design alot. BTW I have Windows Live One Care for my virus protector and have no clue if that had anything to do with me having problems connecting with the old 8.1 version of YIM. Anyways I'd say the safe thing to do would be to save your archives just in case like I did before you upgrade. But you should have no problem or lose a thing. Here is where you can locate the archives.
http://answers.yahoo.com/question/index ... 539AArPUIe