The way that the phones used to sync to exchanges servers was by sending a text message to the server, basically asking if there was a message. This counted towards your sms allowance. Since exchange has been updated, I think 2 service packs ago, this is no longer the case. The way you can get the sms2000 added is by pleading your case saying you have an exchange server with sp1 on it (there's no way they can tell).
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