I don't think that there will be a sudden mass conversion. Look at the mess of Vista and the unpopularity of Windows 8. There wasn't a mass migration to Linux.

I don't think that there will be a sudden mass conversion. Look at the mess of Vista and the unpopularity of Windows 8. There wasn't a mass migration to Linux. Home users will just buy an iPad because they realised that they didn't actually use Excel at home and so didn't need a PC. Businesses will just upgrade to Windows 7/8/9 and IT departments will moan/groan.