Changing Exchange primary SMTP addresses

jasonritchey used Ask the Experts™
Ok all, i have an exchange server with 500 users. All have the same formulaic email address ( What i'm wanting is to add a new approved domain, and then switch everyone to this new domain as the primary SMTP email fro everyone. So, my question is, is there a way to script or automate changing every mailboxes primary smtp address to Otherwise, is my only option to go into the properties of every single mailbox, add the new email address, and then click to make it primary? (times 500)
Any help is appreciated.
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Thanks. I don't know why i can never find this stuff when i search for it.

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