Remove x400 addresses

I have over 5000 users and 700 of these email accounts have x400 that I need removed. I have exported out a csv file that list the emails d usernames. Is there a script to remove these x400 addresses only for these 700 accounts that I have exported?
CiscoAznAsked:
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Jamie McKillopIT ManagerCommented:
Hello,

Assuming your csv contain two columns; emailID, X400

Import-Csv C:\users.csv | % {
      Set-Mailbox $_.emailID -EmailAddresses @{remove=$_.X400}
}

-JJ

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