Backup the phone with sprite backup or spb mobile backup and do a hard reset as follows:
##786#
Menu >>> Reset
enter you msl/spc code
Restore backup, uncheck the box for email, and you'll be all set again. you will have to setup all your email account(s) again, but everything else will be back to normal
Also, a hard reset will NOT clear the internal storage. All you files will remain in tact.
i did this myself and it worked for me! hope this helps!
