Exchange/Microsoft SMTP Authenticated User spam?

["wirepair" <wirepair () roguemail net>]

We've had two calls in the past month regarding supposed authenticated users sending out spam and using their external mail 
servers as relays. I was just curious if anyone else has seen this type of activity. I crawled the archives and saw about 4 posts 
and it seems quite similiar. In one case the person(s) sent over 200,000 emails in a 4 day span. Has anyone seen any scripts that 
do this type of attack? Or has anyone else had this happen to them or someone they know? We would like to give our client a bit 
more information then 'change all your passwords.' Thanks,
-wire
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