If i were to purchase MS Office (any retail version from, say, PCworld or another retailer) and I installed it on my PC, if I then changed my pc, uninstalled office and re-installed it on another pc would this be ok?
And loaded it on my Pc and on two others (sons). Registered online each time with no problems. My reasoning is I bought it so can load it on all pc's in my home. Probably not strictly agreeing to licence but why shouldn't I?
As megat193 says, you are in breach of the EULA if you install the software on additional machines, and although you say "My reasoning is I bought it so can load it on all pc's in my home." You can't do that. You've installed the software on three machines, and if that's OK what about someone who thinks it's OK to do the same on five machines, or on a couple of hundred of networked computers?
Microsoft are quite happy for people to install MS Office on a PC and a laptop, but it stops there as far as they are concerned.
1. GRANT OF LICENSE. Microsoft grants you the following rights provided that you comply with all terms and conditions of this EULA: 1.1 Installation and use. You may: (a) install and use a copy of the Software on one personal computer or other device; and (b) install an additional copy of the Software on a second, portable device for the exclusive use of the primary user of the first copy of the Software.