Tigger how convenient... I knew you would be in here soon enough!
Let me shed some light on your supposed know it all tales that turn out to be just that, tales!
In regards to our past debate on Pixar and Sun Microsystems and what Pixar was actually using in-house:
Pixar switches from Sun to IntelEnjoy the article!
:-D
As for the marketshare versus installed userbase... those 2 numbers don't go hand in hand!
Let's do simple math:
the first year:
Company A sells 90 computers
Company B sells 10 computers
...this results in 100 computers sold in total!
Company A has 90% of the marketshare and installed userbase!
the next year:
Company A sells 10 computers
Company B sells 90 computers
...this results in another 100 computers sold in total to equal 200 in the past 2 years!
Company A has 90% of the marketshare and breaks the installed userbase to 50% between it and company B since now they have 200 computers installed to the actual market overall in use!
Now that was the simple of it! Unfortunately for Dell, it hasn't been around as long as Apple, also Windows PCs have not held their value as long as Macs since Windows didn't start to lead over DOS until after Windows 3.1, while Macs were already being used and like my own Mac SE/30 (1989), is still usable today! There's probably more Macs from the late 80s in use than DOS PCs of the same era!
Of course it's hard to gauge how many computers that have been sold in the last 20 years are still in use, it's more of a guessing game and lots of research!
That's where marketshare percentage becomes obsolete because it can't erase the numbers of past sales and the installed userbase that has been put in place. On top of all that, marketshare shifts from quarter to quarter and year to year. We saw Apple's marketshare rise last quarter (for the US alone) to about 3.7% (maybe 3.9%). These numbers will always change, HP is #1 currently with Dell at #2 and with Legend out of China making inroads, there could be more competition on the way!