[eric12341]

Can't restore deleted contacts if they haven't already been backed up first but to prevent future incidents u can use PIM backup like others suggested or u can use a cloud sync solution like Gmail via exchange or hotmail via exchange, to set either up follow these directions.

-open activesync on the tp2
-tap menu then add server source
-enter m.hotmail.com or m.gmail.com when it asks to enter a server address.
-enter ur email address
-on the credentials screen enter email address in user name,then password.
-next page select what u want to sync then u should be good to go.

This is the best way to go because it's all automatic.