Hello everybody,

Today I had to make a script to compare the Distribution group members between our on-premise environment and the cloud to bee sure that they all are consistent.

The problem I ran into was that the powershell command to get the group members (Get-DistributionGroup) is the same on local Exchange and Exchange Online, so I had to connect/disconnect from each one each time I parse a new Distribution Group, which is taking time and resources…

After some search, I found that in the command “Import-PSSession” use to connect the Exchange (cloud and on-prem) environment, you can use the parameter “prefix” which will be used to make the difference between the on-premise commands and cloud commands.

A bit difficult to explain, here is an example :

Here is how you will create the connection :

# Exchange Online connexion
$ExchangeOnlineSession = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential (Get-Credential) -Authentication Basic -AllowRedirection -ea stop
Import-PSSession $ExchangeOnlineSession -AllowClobber -Prefix “Cloud” -ea stop

# Exchange On-prem connexion
$LocalExchangSession = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri “http://$ExchangeServer/powershell/” -Credential (Get-Credential) -Authentication Kerberos -ea stop
Import-PSSession $LocalExchangSession -AllowClobber -Prefix “Local” -ea stop
Set-LocalAdServerSettings -ViewEntireForest $True -ea stop

Now if you want to get the list of mailboxes in the cloud, you have to type this :


If you want to get the list of mailboxes in your local environment, just type this :


Easy !!!

This, decrease my script time execution from 35 min to less than 5 minutes !

Enjoy 😉