Active Directory problem?

[SoCalMacDude]

We have a PC with a fax server on it (GFI brand). Filemaker Server 9 is on the PC, and when a user sends a fax, Filemaker drops a text file into a watched folder, and the GFI Faxmaker processes and sends the file. Works great.

We are switching to a Mac to host the Filemaker Server 9 solution, and when Filemaker drops the text file into the watched folder on the networked PC, Faxmaker will not process the file.

Any ideas why?