We accept ALL file types from ANY platform. Obviously that is assuming that the file works and actually matches what you intend to print. There are some preferred file types, such as PDF, since modern print production primarily uses these in its workflow. We happily accept InDesign, Quark, Corel, Publisher and other files types created on a Mac or PC.
That being said, not all files or file types are created equal. Your final results can vary depending upon the application or type of files used.
Please see our Submitting Digital Files, Applications We Support, Submitting PDFs, and other useful pages in the Help section for more information regarding file types and links for help with specific programs. And, oh yes, don't forget to include .125" bleed in your files.