I just got a call inquiring about working on an In Design project. I am waiting for the details but my first question is, can a In Design project saved on a MAC be opened and edited on a PC? Also, side note can a PC project be opened etc on PC?
Cross-platform sharing is not an issue as long as you use cross-platform compatible fonts (OpenType or Windows TrueType). HOWEVER sharing between users running different versions of InDesign is not practical except for a one-way move from a lower version to a higher one, and even then you need to watch for text reflowing.
InDesign files are completely crossplatform compatible. The issue will be having everyone on the same version.
Always use OpenType fonts.