palm datebook

When I hot synced my palm pilot this morning with my PC desktop, the stupid palm pilot deleted my datebook information from 2002 to 2005 because I exceeded the memory limit for the desktop, so all the birthday information and appointments for the past three years is gone, I tried to retrieve the information by the datebook.dat file but it deleted all of those appointments. I am so upset that I am not going to use the palm for appointments, I'll just hand write my appointments from now on using my calendar.