How will future upgrades be handled? Will they be free or fee based?

I notice the price for the Professional version has been posted.

How do we purchase it?

Mark, Web admin appears to be a feature in the enterprise edition. See Below. I do not know the answer to your first question although I am curious myself. MailEnable Enterprise Version includes all features of MailEnable Standard and MailEnable Professional and adds the following: Web Administratio...

Recently setup HTTPMail. I receive an error when attempting to mark a message as unread when its current state shows read? Is this a bug or a feature that does not exist yet?

I second the suggestion for alternative postoffice locations. As with many applications I would like to install the app itself to the OS drive/partition and move the "Data" to another.

When you logon using webmail, make sure you use the mailbox name@domain as the username and not just the mailbox name:

Username: name@domain.com
Password: ********