For all the elegance of your integration and AJAX interface, putting a reminder on my screen and syncing to portable devices are essential. My concern is not so much that you may not offer the connectors in the open source version, but that the entry fee for the commercial version — if that's required for these essential features — makes the product impracticable for me (and I would venture to say, a lot of other people).
For my small office, I am looking at competing commercial products that meet my needs and cost a few hundred dollars. They certainly don't do everything Zimbra does, but on the other hand, they do what I need, are mature and will provide customer support. Back to cars: I don't need or want, and can't afford, a Ferrari with all the options, but I can't use a Toyota without a steering wheel either.
If you maintain a pricing plan that discourages a smaller user base, restricting the connectors to the commercial version will, in my view, limit the utility and adoption of the open source version. Of course, there is nothing inherently wrong with that and it may be completely consistent with your plans.  |