I know that syncing for Macs and the P800 (for now) is not supported by Apple's iSync program, Ericsson Client, and most definitely not by SonyEricsson itself.
I have been able to successfully transfer my contacts from my PowerBook to my P800, by exporting the vCard entries of my AddressBook and sending them via the BTExchangeClient of Apple.
When I tried to do the same with the vCal files, however, I ran into a problem. The P800 can receive the vCal file, but instead of prompting me whether I would like to import the data into the Calendar application (like what happened with the vCards and Contacts), it displays the vCal file in the VIEWER application, where it looks more like a tab-delimited file.
Has anyone had any success porting data from Palm Desktop/iCal?
I could really use the help.