Not sure if this is actually what you are looking for but ...
Have you tried a hosted BES provider? I use TheMessageCenter and pay around $18 USD per month. Works flawlessly and can still have BIS accounts. The tech support people are little arrogant, but ask for Tiffany, she's great. I'd go through withdrawals without this service, since we don't use a BES in our firm.
Also, you can find a list of hosted BES services at BBGeeks.com. Look on the menu to right on the home page, "Hosted Exchange" I think it is.
Hope this helps.
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