Create a Shared Mailbox in Microsoft Exchange 2010

A. Create a new Shared Mailbox

Type in the following cmdlet:

New-Mailbox -Name <Maibox Name> -Alias <Alias> -OrganizationalUnit "<OU path>" -Database "<Database>" -UserPrincipalName <E-mail Address> -Shared

And give the appropriate permissions to the user

Add-MailboxPermission <Mailbox Name> -User "<domain\username>" -AccessRights FullAccess

Add-ADPermission <Mailbox Name> -User "<domain\username>" -ExtendedRights Send-As

For example, I will create a new mailbox called Info and setup user Secretary to have access.

New-Mailbox -Name Info -Alias info -OrganizationalUnit "mydomain.local/myCompany/myDepartment" -Database "DB1" -UserPrincipalName info@mycompany.gr -Shared
Add-MailboxPermission Info -User "mydomain\secretary" -AccessRights FullAccess
Add-ADPermission Info -User "mydomain\secretary" -ExtendedRights Send-As

Full detailed syntax and parameters are in this Microsoft link.

B. Convert a User Mailbox to a Shared one

Type in the following cmdlet:

Set-Mailbox "<Maibox Name>" -Type shared

And give the appropriate permissions to the user as well

Add-MailboxPermission <Mailbox Name> -User "<domain\username>" -AccessRights FullAccess

Add-ADPermission <Mailbox Name> -User "<domain\username>" -ExtendedRights Send-As

For example, let’s suppose that we have created a user mailbox called Helpdesk and we need to convert it to a shared mailbox and give access right to user Operator.

Set-Mailbox "Helpdesk" -Type shared
Add-MailboxPermission Helpdesk -User "mydomain\operator" -AccessRights FullAccess
Add-ADPermission Helpdesk -User "mydomain\operator" -ExtendedRights Send-As

Full detailed syntax and parameters are in this Microsoft link.

The last two commands about access and send-as permissions can be configured from EMC gui, by selecting the mailbox and clicking on “Manage Send As Permission..” or “Manage Full Access Permission…” at the right pane of the window.