Actually it isn't. You should be planning a Microsoft exit strategy. One of the hats I wear is "Futurist", and after reading Microsoft's SEC filings and doing some forecasting I've come to the conclusion that Microsoft is headed for Bankruptcy. I'd provide a link, but it would go to my own site, and the forum moderators freak out about things like that, so I'll just suggest you search on the term "Microsoft Death Watch" with the warning that there is about 100,000 words withs links to further documentation.
I get regular visits from IP addresses in Redmond. It appears that someone there is interested.
On the iPad there isn't anything that will handle things like "track changes" which is a nuisance. At least that I've seen.
I would not worry too much about Microsoft. No need to plan an exit strategy just yet. Not sure what you actually know, but searching the web for this 'death watch' says very little because it is the web and that is a great place to learn just about nothing of value, smiley. When MS is truly in trouble, I'll know. The world will know.