I'm running Windows 7 with Parallels 8.0.18619.  When I first attempted to install Yosemite (10.10.x), the installation stalled.  I immediately tried a 2nd time and that time it installed fully.  I've been using it now for about 2 weeks with very little problem.  There ARE some things that don't work properly in OS X.  I think it may have ruined my "Time Machine" installation or maybe not.  I did just buy another backup disk (Passport 1 TB for OS X) which is now working fine.  My "Snagit" program doesn't work anymore.  In Parallels, everything seems fine although to be truthful, I haven't had a chance to run every Windows program.  Excel for Windows works fine.  I'm able to printer wirelessly from both OS X and Win 7.
I DO miss my Snagit though.
I probably should have stated that I ONLY installed Yosemite over Mavericks and didn't alter my long running Parallels 8.x.x.
					 
				
			
			
			
		 
		
		
		
			
			
				Last edited: Jun 16, 2014