I have done this a few times. I have also extracted the main recordings from an Stratagy IES and installed it as the main greeting to make the transition a little easier.

Meyery2K is in the right direction, but the main greeting is not in the mailbox folders. (FYI, you could upload and download personal mailbox greetings, but these get erased when you setup the mailbox). Also, I don't know who said it was the same format as the MOH file, but they are wrong. As mentioned above, it is .VOX just like the IES. I use the free version of Wavepad to convert the files to VOX. This program seems to work best for me.

The files correspond to the prompt numbers for the department greetings. I don't know if the open forum is the best place to talk about the file structure of the IPEdge, so just to be on the safe side, I'll send you a PM of where to upload the greetings.

David
Tele Express Business Systems