Originally Posted by scott_perry
i would recommend that you delete/readd the user when switching devices - especially if going across handheld OS versions. This includes removing the information store.
I tend to recommend NOT doing that!
You lose all the user's history - my users don't like that.
It should be easy to reactivate an existing user on an old device. When you hit problems, I prefer to troubleshoot the issue as opposed to just blow everything away and restart.