[bedoig]

When you delete a sync relationship, you erase anything that was synced from the computer/exchange server to the device. Anything that was input directly on the device should still be there, but it sounds like all your contacts/events/etc came from your computer. Unless you have a backup of the data from your PC before you formatted, I think it is all lost.

Contacts/events/etc are stored in "pim.vol" on the root of your device. In the future you can make a quick backup by just copying that file to your storage card.