So I just puchased the Heroes of Might and Magic V bundle and it says this:

Heroes of Might and Magic® 5 Bundle includes Heroes of Might and Magic® 5 and its two expansions: Tribes of the East and Hammers of Fate.

However, while I can find the Hammers of Fate launch, I am unable to figure out how to launch Tribes of the East so that I can play stronghold. Is there an exe hidden somewhere?

Tribes of the East is a standalone expansion, so you may need to install it separately from your library (while Hammers of Fate is bundled with the original HoMM5 install).

Download the Tribes of the East installer and run it.

It is a stand-alone game.

Thanks guys. I didn't even notice it in my library as it's own game.