I have found some reports on number of PCs sold by quarter (example: http://www.idc.com/getdoc.jsp?containerId=prUS22161710 ) - but I haven't been able to find breakdowns between home and business sales.  Any pointers to free sources of such data?  Any other breakdowns (laptops, desktops, server, OS types) would also be interesting.
Ask HN: Relative sizes of home v.s. business computer markets?