I have been using Doit.im since the days of early BETA. I am a Pro account subscriber. One of the benefits of the Pro account model is using DOIT.IM on a windows desktop. Considering that business line why have you not developed an app for the windows mobile platform? Are you developing a unified Windows Application?
Associated with this is the idea of syncing the calendar with other calendars, such as outlook calendar. Is this a planned feature?
I have recently moved across to Windows Mobile, I work in IT and I find it more practical to work in a Microsoft environment.
Please let me know what your intention is going forward with supporting Microsoft based devices. My subscription is ending shortly and in spite of being a loyal customer since BETA I don't wish to continue with DOIT.im if it's not supporting the windows platform more fully.

Thank you for your attention and all the years of DOIT I hope we can continue. I look forward to your unified windows application, when that happens I will continue subscribing with you.