There are several hosted exchange providors out there. On average you will pay 10-15.00$ USD per user. You will have most all the same functionality without the headache which is upon most us admins with upgrades and patches. Check out this link for a quick comparison
With Exchange 2003's ability to use RPC over HTTP you can connect your Outlook client directly to the exchange server as if you were in the same office as it, however you may notice some speed reduction, depending on your internet connection.
You should have all the abilites you had on your old server with hosted exchange.
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