u didnt use the backup utility, or more than 8GB of addressing space, windows explorer with pluralization support. and for 7 home is missing domain join, native pluralization for .net, vhd support. or support for more than 4 logical cpus (7 supports 8 vista was 4)

pro is only $20-30 more i dont see why any1 would skip it, ulti i can see since its pro+bitlocker and boot from vhd. but home is missing basic functions