You do realise that this has been obsolete for several years, don’t you?
It was superceded by the Fastrack Supreme, which has, itself, now been superceded by the Fastrack XTend.
Therefore, you may have some trouble finding the appropriate tools, documentation, etc:
It is not necessary, but it is sufficient.
Instead of WIPSoft, you could just use the device as a “dumb” modem, and implement the TCP/IP stack and mail protocols in an external application. This is how, for example, a PC uses a modem…