InDesign vs. Quark facts

[Lessa]

Can anyone point me to a news article that says what percent of the market indesign has vs. quark?

I'm trying to convince a client that it will be fine if I use Indesign to create their books. They never open the files in-house. It goes from me to the printer. But they're worried that if I ever leave, all the other designers will be Quark users and won't have access to the previous books' files.

 

[jmgalvin]

Since Quark is privately held, they don't release figures, making it impossible to guage their sales and extrapolating a market share. Since this market is controlled by only 2 companies (Quark-Adobe) and only one is public, no analysts seem to follow it, resulting in a lack of share stats.