Question: What does it take to build a Palm OS application (e-mail, calendar, tasks, memos, contacts) that works seamlessly on the Palm OS with Exchange Active Sync?

There are some talented developers out there (Dataviz, Iambic, Chapura, etc...) but since the Direct Push/Pull functionality was offered for Palm users, I have not found that "one" application that works as Outlook Mobile on my previously owned 700wx.

Palm's contacts app is sufficient, but I would like better "remote" lookup from my Corporate directory, the ability to invite attendees (wirelessly and not through sms), and sincere PUSH for e-mail.

Is it difficult to develop this?