ADModify : Remove CCMAIL: and MS: Proxy Addresses

Looking for guidance in removing old CCMAIL: and MS: proxy addresses using ADModify if possible.

How does one go about this? These seem to be preventing me from migrating user mailboxes to Office 365.

Thanks in advance.
Christian HansAsked:
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K BCommented:
I personally would give this a try.  

https://gallery.technet.microsoft.com/office/Powershell-to-ADD-Remove-85adf04b 

I would test with a fake proxy address prefix on a single mailbox, perhaps add one secondard email address to an existing mailbox.  For example,  XXMAIL:joe.smith@contoso.com
then search for XXMAIL:* in the script.
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K BCommented:
Also, what is the error you are getting while migrating?
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Christian HansAuthor Commented:
Had a buddy that had some knowledge of AdFind and ADMod, and that did the trick...
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