I have iWork installed n my Mac, and I like it. But now my wife is starting to use Excel more and more at her workplace, she she would like to take some of her work to home, so she doesn't have to sit in late at the office. I'm quite hesitant to make her user iWork for this (she does use it, but for other purposes, like word-processing), since the two might not be 1:1 compatible with each other, and Excel and Numbers behave in different way. So if she learns to do something in Numbers, it might not help her to do the same thing in Excel. So I'm planning to buy Office 08. Now, how compatible is the Office 08 for Mac with Office 03 for Windows? Is the UI similar enough that she can transfer skills learned in one version to the other? I assume that the files are 100% compatible? Is there any caveats I should be aware of?