Exchange 2007 - Bulk Create Groups

• import-csv "C:\filename.csv" | % {New-DistributionGroup -Name $_.Groupname -DisplayName $_.Displayname -OrganizationalUnit "domain.local/groups/distribution" -SamAccountName $_.SamName -Type Distribution}
• Make sure your spreadsheet columns match the names above so that:
• Groupname = The name you want the distribution group to have in Exchange (NOT the display name!)
• SamName = Specify the same name as the Group Name. It's for AD.
• Displayname = The display name (the one that contains #)
• import-csv "C:\filename.csv" | % {Set-DistributionGroup -identity $_.Groupname -EmailAddressPolicyEnabled $false -PrimarySmtpAddress $_.email -RequireSenderAuthenticationEnabled $false}
• Make sure your spreadsheet columns match the names above so that:
• Groupname = The name of the group you want to change
• Email = The email address you want to specify (if different than default)
• If no groups need their email address specified, then run this command instead:
• import-csv "C:\filename.csv" | % {Set-DistributionGroup -identity $_.Groupname -RequireSenderAuthenticationEnabled $false}