If paying for a BES really isn't in your budget, then maybe Astrasync is a viable alternative for you. Astrasync has just rolled out their latest beta release to customers and it's bundled with a ton of new additions and features to make the services even more of a compelling offer. The following improvements have been made in AstraSync 4.2 Beta over AstraSync 4.1:
We previously reviewed Astrasync and it has always been one of those offerings that we seen as a cost effective way to get BES like services at a lesser cost. Well worth a look into if you need what they offer.