This method finds the next PimItem in a collection that passes the restriction specified by the most recent call to Find(String).
The item that was found, or NULL if no item is found which passes the restriction.
Note that this function can only be called after Find(String) has been called.
Using Find(String) and FindNext, you can enumerate all the items in a collection which meet a certain restriction.
Items are returned in the sequence determined by the current sort order.