I have a customer that bought a repo building that containted a Partner telephone system which includes a Partner Messaging 7.0 card. The PCMIA card has been removed from the unit and when you call into the system you get a recording that says "the system in in maintenance" (or something like that).

I'm assuming the Partner Messaging cannot operate without out the PCMIA card and they'll need a new 2,4, or 6-port card. Am I correct?

Yep you are correct.
They discontinued the 2-port card a few months ago.
Now it's 4 or 6 port only. Unless you can find someone that still has a 2 port laying on the self.

Thanks Mike!