You are right- I was more referring to say Office 2008 and prior. My point was just that compatibility is key, and even minor differences between older Office versions caused issues... so by comparison Google Docs and Apple's suites are even more off the mark in terms of strict compatibility.
It's strange that only Microsoft have realised about the compatibility issue, basically putting their hand up, admitting it was an issue and finally fixing it (albeit only for 2010/2011 onwards).
Whilst Apple and Google have their own formats and a half hearted Office compatibility mode which is useless if you want to preserve formatting (and who doesn't). If either really want to compete with Office they should be focussing on 100% compatibility or getting together to push a single standard.
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Or just raise the price 30% more that you intended to sell it for on a surface. Then keep the surface apps at that original price and if apple users don't want to be overcharged app-wise buy surface instead of an iPad.
Just have a few feature changes to say its not the same app on 2 platforms.
Wouldn't work as they're selling it as a multi-device subscription - they're not actually selling the apps which are likely to be free downloads and then you'll need to be signed in to your Microsoft Live account to actually use them.