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Changing Email Address Policies (remove old email address format)

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Last Modified: 2016-02-25
Quick question,

I am trying to clean up our Exchange 2013 environment before going to O365, our company has some OLD Email Address Policies in place... the default, contains smtp addresses alias@nolongerinuse.com which is not a primary SMTP nor even in use. We also have the old X400 address in there.

I want to remove these, and apply... would this cause any issues, provided that no use has been using the alias@nolongerinuse.com email address or the X400 address? After applying, this will remove the addresses from the users mailboxes correct?

I know that after running the Office 365 hybrid config wizard we our tenant will be added to it, which is fine...

Anything Im overlooking? Any gotchas? Thanks in advance.
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