This document will outline what steps USM Macintosh users will need to take in order to migrate their network printers to the new Windows servers.
Download, open, and run this "USM Printer Utility"
If you are running OSX v10.7, 10.8, or 10.9 (Lion, Mountain Lion, or Mavericks), Gatekeeper will likely interfere with your ability to open the script inside the above file. Make sure to RIGHT-CLICK (or hold down the CONTROL key and LEFT-CLICK) the file and choose OPEN.
Here is what the prompt looks like. (It may say that it's "an application downloaded from the Internet and/or it's "from an unidentified developer.":
The dialog is from GateKeeper, and is prompting you to verify that you want to run an unidentified utility. Please click OPEN to proceed. (Do the same if it just says that it's an application downloaded from the Internet.)
Further directions for choosing the correct printer driver and enabling printer features are here: