Add AD contacts (also in a .CSV) to Exchange distribution list

Hi,

I have just imported several CSV files into mail enabled contacts in MS Exchange 2010 using this command

Import-Csv C:\Export\EarlyIntervention.csv | ForEach { New-MailContact -Name $_.DisplayName -ExternalEmailAddress $_.EmailAddress -OrganizationalUnit "BoardMembers" }

So now those users are contacts in my AD/MX servers.

I wish to be able to import those members into a distribution list called @BoardMembers howeveer when I run this command

Import-Csv C:\Export\BoardMembers.csv | ForEach-Object -Process { Add-DistributionGroupMember -@BoardMembers -Member $_ }

It doesnt work

Any advice on how to do this is appreciated!