I've had my blackberry curve since March and had no problem synching it with the desktop software. All of a sudden after the latest update my calendar has become "uninstalled". I have tried reinstalling the software and rebooting the phone but nothing has worked.
I have provided some information below that may help.
Step 1 – (If applicable) try restoring a backup file. (Instructions below)
Step 2 – Try using the application loader on the Blackberry Desktop manager to transfer the calendar application back on to the device.
Step 3 – Try to remove the initial synchronization and set it back up. (Instructions below)