This cmdlet is available only in on-premises Exchange Server 2016.
Use the Update-Global Address List cmdlet to update the recipients included in a global address list (GAL).
Instances of mail that is bounced back to the sender may also be fixed.
Please use the steps below to update your Global Address Book.
For information about the parameter sets in the Syntax section below, see Syntax.
You need to be assigned permissions before you can run this cmdlet.
parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.These accounts why greyed out in comparison to the normal accounts.I tracked this down to that the client had cloned some accounts from an account that used to have a mailbox attached to them.Came across this issue at a clients, they where running Exchange 2010 although this would also apply to Exchange 2007.When a user in Outlook was NOT in cached mode and they went into the Global Address List to select users to send an email to they would see accounts of people who have not got a mailbox attached to them, were not mail enabled and did not even have an email address associated to them.Complete a brief survey to get a complimentary 70-page whitepaper featuring the best methods and solutions for your virtual environment, as well as hypervisor-specific management advice from Tech Target experts.