how to recover lost calendar data

hi,

I found this forum while googling for some help after having lost crucial data.

I use evolution 2.0.4 on fedora.
It crashed and now all my calendar data has disappeared. Stupidly enough my back-up is too old to be any useful.
Emails and contacts dont seem to have been affected. I don't use tasks so I cant say if anything happened to them.

Does anyone have any idea of what I could try to do in order to recover the calendar?
Or should I just forget about it and bang my head against the wall for a few minutes?

thanks

maypo.m