Add global address list
Add global address list:
New-GlobalAddressList -Name “Firm 4 – GAL” -IncludedRecipients MailboxUsers -ConditionalCompany Firm4
Creates the global address list based on “company” in the user object.
Remove global address list: remove-GlobalAddressList -identity “Firm 4 – GAL”
Show global address list: get-globaladdresslist