The enterprise market is:

(a) mind-blowingly huge; (b) totally accustomed to paying serious money for software; (c) almost universally dependent on the Microsoft stack for supporting end users, and that means Outlook for optimal integration with Exchange, Active Directory, etc.; (d) totally addicted to e-mail.

Admittedly, it's also (e) resistant to change and chock-full of drones content with maintaining the status quo. Still, if the Xobnis are persistent, if they keep working on this thing, they'll have a gold mine on their hands.