I also see a number of people suggesting that Apple should be afraid to "upset" Microsoft.
Microsoft won't be "upset" into action for emotional reasons. MS will act (perhaps not always intelligently

) for profit and sales reasons.
In other words, style or "tone" (which is still an unknown for this store campaign!) will not provoke MS into taking action against Apple. Selling too many Macs, in theory, might.
So, is the argument that Apple should not sell TOO many Macs, or Microsoft will retaliate? Like canceling Office?
Well, they might--they have done such things before. However:
1. They would risk anti-trust action, and Bush's Department of Justice won't be in control forever.
2. They might cancel Office anyway, even if Apple DID keep Mac sales low on purpose.
3. There ARE alternatives to Office--even free ones. It would take time and money to polish them up, but Apple (and others) have both. I doubt Apple has an Office clone ready now, but I am sure they have considered various plans for surviving without Office.
4. Once upon a time, the Mac had little momentum and was highly dependent on Office. Not now. Now, the lack of new versions of Office would hurt a lot--but it would not be a death blow.
5. Things do change with time. Microsoft will not be able to bully the whole industry forever. They do NOT always get their way. I feel it's OK to risk making them scared.
I don't think Apple should hold back Mac sales on purpose. And I don't think anything BUT sales is going to "upset" MS enough to cancel Office.