I am not familiar with MohairSofa Calendar + so I went to
http://www.mohairsofa.com/Default.aspx/document/10
Before trying Jogga's suggestion (which I also thought of suggesting, but hoped something less drastic might work).... you might want to try uninstalling Mohair Calendar..... then try to sync and see if Outlook syncs with the calendar that came with your ppc.....
and then try re-installing Mohair Calendar (check their site for most recent/best version.....sounds like there were a few bugs in it)..... and then try syncing again.....
Susan