In Exchange 2010, granting a group access to a mailbox was really easy with the GUI, but today in exchange 2013, 2016 and 2019 it’s not that easy anymore.
To add a group to an exchange mailbox in 2013, 2016 and 2019 you need to use the EMC (Exchange management console). It’s still quite easy but if you are not used to it, it might seem a bit tricky but it’s really not.
First open up the EMC and enter the following command:
Add-MailboxPermission -id ALIAS -User "Group Name" -AccessRights Fullaccess
Where “ALIAS” is the “Display Name” found in the attribute section of the account, and Group name is the group you created.
For example i want to add the group “CE-Admins” to the mailbox “firstname.lastname@example.org”, which has the display name “admins” in the Active Directory the command would be:
Add-MailboxPermission -id admins -User "CE-Admins" -AccessRights Fullaccess
Then, if you want to give the group Send-As permissions you can use the following command:
Add-ADPermission ALIAS -User "Group Name" -ExtendedRights Send-As
Once done you will see a success message.