I'm thinking of buying the Iphone 4, but I currently use MS Outlook with the GTD addin. I've read quite a few of the posts here on this subject as well as elsewhere. It seems like Exchange is the favoured way to go. I'm on Exchange, but find when I access it through my web browser, it has limited functionality e.g. no Categories with the Tasks. Can anyone speak to this re their experience with Iphone? What about Calendar, Notes, Contacts? Thanks for any possible help.