Msn Adcenter is Bing's Search Engine Pay Per Click platform.
One issue you might run into with them is the hold they can place on your account.
While the hold isn't a ban, like the way the Google Ban is which bans you for life, this temporary hold can put your income out for a week.
This often happens when there are billing issues like when billing does not go through.
If you try to open another account, that account can get hung up also. and its automated.
So if you intend to market with Bing advertising, remember to keep a credit card dedicated for that use only and keep your credit limits high, especially if you run big adspend dollars on their platform.
other thing is..
call them up immediately and don't wait for email replies. calling them up at their support number speeds things up a bunch.
To Your Success!