<t>A lot of environments in hybrid setups ended up keeping the Exchange management tools installed on a management server even after decommissioning the last Exchange server. Microsoft released the Exchange Management Tools specifically for that scenario so you can still manage recipient attributes without running a full Exchange server.<br/>
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That way you still get the Exchange PowerShell cmdlets like Set-Mailbox, Set-RemoteMailbox, etc., which handle the attribute logic correctly instead of editing things like proxyAddresses or targetAddress directly in AD.<br/>
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For GUI options, some teams expose a simplified interface through internal tools or helpdesk portals that just run the PowerShell commands in the background. Others use identity management platforms (like Adaxes or similar AD management tools) which provide a GUI and write the correct attributes.<br/>
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Editing the attributes directly in ADUC is technically possible if you enable advanced attributes, but it tends to be risky for helpdesk workflows because it's easy to break proxyAddresses formatting or other Exchange-related fields.<br/>
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So the common approaches I usually see are either keeping the Exchange management tools installed somewhere for PowerShell management, or putting a third-party AD management tool in front of it to give the helpdesk a GUI.</t>
