I just looked at the site.
It lists that it does not need BIS or BES. However, you will need some form of data plan, otherwise you will rack up some hefty bills using data to sync with no plan.
My opinion, have your current admin install BESX. It's free and can do what you want. I understand you say he's incapable of doing so, but there's plenty of documentation out there on how to install it.
The difference between stupidity and genius is that genius has its limits.
When you take things for granted, the things you are granted, get taken.
Even a mosquito doesn't get a pat on the back until it starts to work.
Too many people miss the silver lining because they're expecting gold.
[BES 5.0.3 / GroupWise 2012 HP2]