Don't know about the hosted BES options.
But I do know that you don't need MS Exchange in order to use the in-house BES. All you need is Windows Server 2003 (or newer) and MS Outlook 2003 (or newer). Outlook provides all the Exchange support you need to connect the BES Pro 4.x to Zimbra NE 5.x (or newer).
We have this all running in a little VM on our Zimbra server, and it's been running great for just under a year now. No Exchange services, installs, licenses, or even docs needed.
There is a limitation of 50 BES clients in this setup (not sure if that's a BES Pro limitation, an Outlook limitation, or a Zimbra limitation). However, all it takes is to provision another VM for every 50 clients.
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Freddie
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