Yes (you can run ExtendSim on a Mac) and no (just not natively)... and yes it will! Confusing? Let us explain. 

The application gurus at Imagine That Inc. are hard at work on a Mac version of ExtendSim right now. It should be just like the Windows version, but able to run natively on a Mac. And you will be able to exchange your ExtendSim models back and forth with colleagues between the 2 operating systems. We don't have a specific date when ExtendSim for Mac will be ready, but we will keep you updated.

What are my options today?

Run the Windows version of ExtendSim on your Mac, but in the Windows operating system. To do this, you need to obtain the Windows operating system and an emulator. You can use Boot Camp Assistant (installed with the Mac operating system in the Utilities folder under Applications). Or install the emulation software Parallels (www.parallels.com). During installation, Parallels will request the Windows operating system installer to complete the process. Once the installation is complete, you can install the Windows version of ExtendSim.

Run the Windows version of ExtendSim on a Windows computer.