When you tag some contact to one of the group (in STL) when you sync with outlook (with the "sync contacts with: group name " tick, after sync, I am unable to find the contact where I tick in the STL group.
This happen to most of the contact manager when you create a group and whoever you put them into the group, after sync with outlook, those name were gone in outlook address book.
Group is very good feature, but if I can't find names in outlook address , then I think most of the users will not use the group function.