Office 365: Find who has email address

We have 2 domains (on different sites) using Outlook 365, I need to find who has a specific email address.

We are using Azure AD connect. Anyone know an easy way?
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Vasil Michev (MVP)Commented:
Who has a specific address where, in O365 or on-prem? It's easy to find it via the Get-Recipient cmdlet:


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but that requires Exchange. If you need the on-prem object and you dont have Exchange on-prem, use the AD cmdlets:

Get-ADUser -Filter "proxyAddresses -like '*'"

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Note the trailing *, it's added to cover all address variations (SMTP, smtp, SIP, etc).

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HKFueyAuthor Commented:
That's really helpful and super quick! Thank you.
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