Microsoft Word

[Compass Call]

After reading some Word documents when I close them I am asked if I want to save changes to the document. This happens even though I have not made any changes. This does not happen with all documents, just a few!
Does anybody know why this is happening? What have I done wrong to be asked this question when no changes have been made and how do I fix it?
It's just annoying me!
I am using Windows XP Home SP2 & Office XP.
CC

[ZH875]

Could be due to having autocalculated fields in the document, such as Date, this will change on document open, thus the document would need saving.

ZH

[Gertrude the Wombat]

Could be due to your having a different printer installed than the person who wrote the document. It'll reformat for the different print metrics and want to save the result.

Going back a few versions, putting "page n of m" in the header or footer could do this - it counted how many pages there were in the document on opening it, replaced all the instances of "m" with the same number, and regarded this as a change that needed saving. I don't know whether or not they've now fixed this.