The flip side is that I'm never ever going to use a diagramming tool that isn't compatible with windows. Even if it were great, the fact I can't use it on my c

The flip side is that I'm never ever going to use a diagramming tool that isn't compatible with windows. Even if it were great, the fact I can't use it on my company workstation? Useless. Or even if I happened to have a mac workstation - being unable to share the source files with colleagues? It's dead on arrival. So basically it's a great diagramming tool so long as you work at a company that exclusively uses Macs. Which there really aren't many of. It's basically a diagramming tool for employees of Apple. Who, by the way, produce their own similar (less good) tools. The productivity tools? Fine, you don't need to be able to share that. But Omnigraffle is juts a bizarre decision.