Lost market share in every single industry? Sources? If anything, it should have gained especially where server technology is concerned. Most of the "Microsoft will end up like IBM" is based on pure hype and myths.
In the corporate world, it's Windows or NOTHING and with reason too. Office 07 works better, for professionals that want to get stuff done. I tried using Pages, NeoOffice, and OpenOffice for technical documentation? Guess what? I went back to Office 07 immediately.
You are in every mac vs pc thread. Seem to be every time bashing others while praising MS. Not to insult you or anything, but keeping that attitude up will label you here as an MS fanboy.
Yes, the poster you quoted has no sources, but it is very true MS has lost market share in everything.
Look at browsers, IE has been bleeding out market share to either FireFox, Opera or Safari.
Look at the mobile software industry. They can't match up, even Ballmer admitted in Barcelona that the rest of the mobile industry is trying to copy Apple. Windows Mobile is getting a revamp, not because MS wants too, but because mobile OS like, iPhone OS X and Web OS based Palm Pre and Android Open Source are seriously taking a beating at feature and development lacking Windows Mobile. (also these at the same time beat down Symbian OS)
Look at the Server market in the commercial Internet. Its either Linux based or Mac OS based. A company can't have the luxury of using Windows and risking its virus attracting nature to something as important as a web site or for that matter a web site that carries out check-outs (eBay, Visa, MasterCard for example).
Look in the consumer notebook and computer world. MacBooks are the top sellers every time, and in PCs, OS X is rapidly gaining market share despite the hefty price tag of Macs.
The Internet search business? Live.com can't gain any market share at all. It wins a bit one quarter just to lose it next quarter. This is despite MS having rolled out the cashback program.
People don't want to frustrate themselves over, they don't want last years advancements in a buggy or unstable environment when another company (either Apple or Google or some one else) can offer them long ago and better developed.
I will not argue with you in terms of Office, because basically that is MS flagship application suite. Sure, its great, but it is starting to become outdated by many standards. Word is losing its ground when it comes to pages. Excel is very good, and I will admit, Numbers is a joke. However, Keynote is seriously improving at such a fast rate in very little time, it will oust PowerPoint, if it hasn't already.
Sure people will complain to adapt to something new, but once they see how much better it is, its just a matter of time before Office (if the case is MS falls behind) gets replaced or starts bleeding market share also.