Exchange Management Console (EMC) doesn’t allow you to create more than one GAL but PowerShell gives you that functionality.

Before you start you should have Exchange Organization Administrators role in your organization since this is organizational level changes.

Microsoft gives the theoretical limit about number of GAL/Address List in organization is 1300 but I feel nobody would have tired that.

Take a look at Address Lists before creating New GAL in my testing environment.

 
 
 
Now lets see mailboxes list
 
 
 
 

Now lets see the syntax for creating New GAL

New-GlobalAddressList -Name <String> -IncludedRecipients <Nullable> -ConditionalCompany <String>

Example to create a GAL:

New-GlobalAddressList -Name “Company 1″ -ConditionalCompany “Company 1″ -IncludedRecipients “AllRecipients

Here is the new GAL available in Address List and in OWA with all the recipients. 

 
 
 
  • Here we created the GAL based on Active Directory attribute named Company, in the same way we can create based on below different attributes.

     Company 
     CustomAttribute1 – CustomAttribute15
     Department 
     StateOrProvince

  • Switch -IncludedRecipients can have below different values as per your requirement.

     MailboxUsers
     Resources
     Mailcontacts
     MailGroups
     MailUsers
     AllRecipients

 
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