WARNING, There Has Been A Change Made To Your Server

[Matchstick]

I'm not sure what exactly causes this Warning. I just had it a last week. But you shouldn't need to worry. All it's doing is removing your synced info, and then putting it back just as quick. So whatever you have Activesync back up on your computer to Outlook. It's just redoing the whole thing. Takes about as long as the first sync after a hard reset/flash.

I would imagine that all it means is that something on YOUR "server" aka your computer, changed. For instance you changed a contact in Outlook or something. All it does is go "whoa. these two devices are different. Better resync completely" and it pops up as a vicious warning on your phone/pc when it really isn't anything other than a refresh on the synced info.