We built a .NET server application that hosts data (contacts, email, etc.). We'd like to sync our data to mobile devices: iPhone, Windows Mobile, Blackberry, etc.
How should we go about doing this?
Build several mobile apps, one for each platform (e.g. app for iPhone, app for Blackberry, etc.), each app syncs with our server.
License Microsoft Exchange protocol technology from Microsoft, so that our server application pretends to be an Exchange server, thus making syncing work automatically on all the different platforms (As we understand it, iPhone, Windows Mobile, Blackberry, etc. all have built-in syncing capability with Microsoft Exchange).
Are there other options to consider?
Any suggestions?