That is precisely my doubt and the subject of a recent post.
I cannot understand why he recommends an earlier version which, incidentally, did not work for me.
I could never get that version of Xampp to run Apache, even after opening port 80 both TCP and UDP.
What I got instead running was...IIS.
I uninstalled Xampp, disabled IIS, and loaded wamp5 (thanks to user Get 'em fast, read post).
Great performance!!
It doesn't have a mail server, though, but it works beautifully.
Now my problem is how to install Zen Cart and mail test accounts on that server, but should be pretty easy.