How to hide a distribution group in Exchange 2010

Use the below command to hide the distribution group from Global Address List in Exchange 2010

Set-DistributionGroup -Id "Distribution Group Name" -HideFromAddressListsEnabled $true

In future if you want to see the Distribution Group in Global Address List, use the below command

Set-DistributionGroup -Id "Distribution Group Name" -HideFromAddressListsEnabled $false