The problem of migrating one’s Calendars & Contacts between XP & Mac is hectic & time consuming,with no direct solution.IN-LooK is a plug-in for MS Outlook,used to import & export popular file formats in batches;thus,backing-up & sharing files easily.
Nikita is a peer-to-peer PIM. It will offer all the same benefits of the standard PIMS (such as Outlook or Chandler) but will not require a central server. Items can be marked as Calendar, Task, Email, etc... or any combination of those. Silos be gone!