PowerShell Script to remove undesired/obsolete Proxy Address types (CC:MAIL, MSMAIL, etc...) from ALL mail-enabled objects types in an Exchange Organization.

Author : Cary GARVIN
Credit : Aaron Guilmette
Contact : cary(at)garvin.tech
LinkedIn : https://www.linkedin.com/in/cary-garvin
GitHub : https://github.com/carygarvin/

Script Name : Cleanup-ExchangeProxyAddresses.ps1
Version : 1.0
Release date : 28/04/2018 (CET)

History : The present script is inspired from the 'Remove-ExchangeProxyAddresses.ps1' (https://www.powershellgallery.com/packages/Remove-ExchangeProxyAddresses/4.1 or https://www.undocumented-features.com/2017/02/10/removing-proxy-addresses-from-exchange-recipients/) written by Aaron Guilmette, but on steroids... In addition to removing these CCMAIL, MSMAIL addresses from Mailbox, MailUser and MailContact objects, this present version will remove these addresses from ALL possible mail-enabled objects in any Exchange Organization. Additional objects are RemoteUserMailbox, DistributionGroups and MailPublicFolders.

Purpose : The present script can be used for mail objects cleanup prior to any migration from any Exchange version above Exchange 2010 to a higher version or to Office 365/Exchange Online. It will cleanup obsolete CCMAIL and MSMAIL, or more if you wish (specify which address types in $UndesiredAddressTypes array) from ALL mail-enabled object types.

To run the present Script, you need Exchange Admin privileges. Edit the $UndesiredAddressTypes array within the Script to specify which types of Proxy Addresses need to be removed.