Can he get out of mp and back in?

I don't know if it works the same for COD, but in mmorpgs for example if the login server goes down, those who were in before can stay in and play but those who are out can't get in. And obviously if you are in and get out, you can't get back ingame.

Bad news:One of my friends is playing mw2 w/0 problems because he did not hack rank or prestige and at the same time other friends that did the hacks cant join =(

No i have a non hacked account and a hacked account, both do the same thing, Tuseday is a common day for Server Maintenance

Srry the banned out the ip address not the account so your every accounts are banned

I don't think so, I just managed to get in on my prestiged account...