Merge two iCal files- Help
I have two Macs, a desktop and a Macbook air. The desktop had a problem which kept it off line for quite a while. It is now working. I wanted to merge several years worth of old iCal information onto my Macbook Air calendar, which has only recent and future appointments. I exported the deskto iCal information into a .icbu file. When I tried to import it into my Macbook Air calendar, I got a warning the the current info would be replaced.
Any ideas how to do a clean merger? There would be few, if any duplicate events.
Thanks
PowerBook, OS X Mountain Lion (10.8.3)