Exchange Powershell shared mailbox permissions problem

I have added a shared mailbox in Exchange PowerShell, but I cannot assign permissions. I added the shared mailbox with the following line:
New-Mailbox -Name:admin  -Database:'Mailbox Database' -UserPrincipalName:'admin@domain.com' -Shared

Then i added users with the line:
add-mailboxpermission admin -user: Kristen -AccessRights:FullAccess
I then added the same line for 1 more user.

Now when I try to set Permissions I get the following:
[PS] C:\Windows\System32>add-adpermission admin -user: Kristen -ExtendedRights:Send-As -AccessRights:ReadProperty, WriteProperty -Properties:'Personal Information'
Add-ADPermission : There are multiple objects matching the identity "admin". Please specify an unique value.
At line:1 char:17
+ add-adpermission  <<<< admin -user: Kristen -ExtendedRights:Send-As -AccessRights:ReadProperty, WriteProperty -Properties:'Personal Information'

If it matters this is for a small company and Exchange is part of SBS 2008.
What am I missing?
LVL 1
LostInWindowsAsked:
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MesthaCommented:
Why aren't you using the GUI? Full mailbox access can be granted through the Exchange Management Console and is much quicker than using PowerShell.

Simon.
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