After a crash, all events but one are gone. But the contacts and mail are intact.

I was deleting old emails from Outlook 2011 for Mac, OS 10.6.8, when the program crashed. 

Upon restarting, all my calendar events were gone, except for one event.  Meanwhile, all my contacts and email appear to be intact.

I have my Outlook data backed up with duplicate of my identity, but that backup was from three weeks ago. 

Is there a way to merge the newer emails and contacts that are still on my non-backup identity with the backed up identity, with the intent to not lose any of the data created between now and my last backup?

I also have Outlook 2011 syncing with iCal in order to sync with my iPhone. 

Thanks in advance,

catfell