I'm pretty sure I already know the answer to this but I thought perhaps there were new developments of some miraculous sort since I last researched this.
Long story short - we're a medium sized nonprofit organization. Our head office branch uses SBS 2008 with Exchange 2007 for email. It's been working delightfully, even if Exchange is a bit of a resource pig. There are 11 people on the Exchange server, and 4 of those people are using Blackberries with the Redirector. It's been working fine for the most part, but my CEO really needs access to his email all of the time, and our new home in a new office tower has been having planned power outages fairly frequently. Part of the reason we moved in here was because they had a generator for backup power but it seems like they've been bringing that down as well. As a result, it leaves us without access to our email because they need to turn off their computers over night since that's when the outages occur.
Now I've considered using BES Express for our Blackberry stuff, but it doesn't eliminate the fact that our power goes out. The server is on a UPS of course, but not enough of one to hold it for more than an hour at best (and that's being generous). I've also considered outsourcing Exchange and BES but that's an expense I'd rather avoid since again - we're a nonprofit and all the pennies add up. That's why i was hoping I could just take the Blackberry users out of the picture and leave the Exchange server running for everyone else because that would at least reduce the cost.
Thoughts? Suggestions? Things I didn't think of?