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Get-UMMailbox

Use the Get-UMMailbox cmdlet to view existing mailboxes that are Unified Messaging (UM) enabled. Exchange PowerShell reference

From the Exchange PowerShell reference 10 parameters Its page in the reference

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Parameters

10 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the UM-enabled mailbox that you want to view.
-AnrThe Anr parameter specifies a string on which to perform an ambiguous name resolution (ANR) search.
-CredentialThe Credential parameter specifies the username and password that's used to run this command.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-FilterThe Filter parameter uses OPATH syntax to filter the results by the specified properties and values.
-IgnoreDefaultScopeThe IgnoreDefaultScope switch tells the command to ignore the default recipient scope setting for the Exchange PowerShell session, and to use the entire forest as the scope.
-OrganizationalUnitThe OrganizationalUnit parameter filters the results based on the object's location in Active Directory.
-ReadFromDomainControllerThe ReadFromDomainController switch specifies that information should be read from a domain controller in the user's domain.
-ResultSizeThe ResultSize parameter specifies the maximum number of results to return.
-SortByThe SortBy parameter specifies the property to sort the results by.