I sync my ppc at both work and home. What this means is that when I sync at home I must filter on some of the calender items so that it doesnt get upset looking for contects that dont exist on my home PC (as the items originated from my work PC). I select only to sync calender items with a 'personal' category. This works OK, although then Active Sync says there are lots of unresolved items and suggest I resolve them - of course when I do that it gets mildly upset that it can't find the contacts that the appointments refer to. This all seems rather inelegant - I think it should know I excluded them because of the filter and doesn't think they need resolving.