Exchange 2010 configuration

I am running the following command in powershell
Set-OABVirtualDirectory -Identity "CAS01\OAB (Default Web Site)" -ExternalUrl -RequireSSL:$true

Getting the following error

The term 'Set-OABVirtualDirectory' is not recognized as the name of a cmdlet, function, script file, or operable progra
m. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:24
+ Set-OABVirtualDirectory <<<<  -Identity "Mail\OAB (Default Web Site)" -ExternalUrl
B -RequireSSL:$true
    + CategoryInfo          : ObjectNotFound: (Set-OABVirtualDirectory:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException
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StuartTechnical Architect - CloudCommented:
You need to run this in the exchange management shell OR setup a remote connection to exchange within powershell to run this command

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StuartTechnical Architect - CloudCommented:
If you don't have access to the EMS use the following to connect

$UserCredential = Get-Credential
Enter credentials Domain\Username

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "http://<FQDN of Exchange 2013 Client Access server>/PowerShell/" -Authentication Kerberos -Credential $UserCredential
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