because your organizer stores deleted e-mail in the deleted folder until you perform a hotsync operation, deleted e-mail can monopolize storage space. to avoid or correct this problem, purge the contents of your deleted folder. e-mail that you purge is still deleted from your desktop e-mail application when you perform the next hotsync operation.
to purge the contents of the deleted folder:
1. tap the menu icon

.
2. tap message, and then tap purge deleted.
3. tap yes.
you cannot restore e-mail items after you purge them.