Well look at it now, the tablet comes with NO PIM, expecting you to have a good one on the phone. I had an older Samsung with a rotten PIM before, and wasn't frosted.

Here's an easy solution. Sync both to a Nokia phone by bluetooth and to an online web calendar. For other phone users, tell them they can visit the online calendar via phone browser or put the burden of downloading and syncing to the other handset manufacturer.

Instead of telling their own customers (tablet users) to suffer and use the online version they could tell other non-users to do so. Cater to their customers and make owning a tablet a preferable solution.

Major bonus points for making the online calendar open source and possible to host anywhere. Make "MobileMe" obsolete before it's even released!