Hi,
The Pro version is simply Gossamer Mail + an integrated mail server 'qmail'. It is for people who want to give out email accounts, plus have POP access.
We will install qmail, a high performance mail server, and configure it so that pop accounts get automatically created and removed whenever Gossamer Mail accounts are added.
Cost is $900 US which includes a license of Gossamer Mail. If you already have Gossamer Mail, it costs $450 for us to install qmail and configure it (which includes setting it up for large number of users, etc).
Cheers,
Alex
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Gossamer Threads Inc.