I need help created a SHARED MAILBOX using Exchange 2007

I have been tasked with setting up shared mailboxes on our Exchange 2007 server. I have already discovered that I cannot use the Exchange Management Console and believe I need to go through the PowerShell. I tried the command below but got the following error. Do you I need to set up a user account in active directory first? We are running Windows 2008 domain level. Am I on the write track with the command below? Maybe I
Just made a typo? All advice welcome

PS C:\> New-Mailbox -Name:'Budget' -OrganizationalUnit:'Domain.com/Exchange Res
ources' -Database:'Mailbox Database' -UserPrincipalName:'budget@domain.com' -Sh
The term 'New-Mailbox' is not recognized as the name of a cmdlet, function, scr
ipt file, or operable program. Check the spelling of the name, or if a path was
 included, verify that the path is correct and try again.
At line:1 char:12
+ New-Mailbox <<<<  -Name:'Budget' -OrganizationalUnit:'domain.com/Exchange Re
sources' -Database:'Mailbox Database' -UserPrincipalName:'budget@domain.com' -
    + CategoryInfo          : ObjectNotFound: (New-Mailbox:String) [], Command
    + FullyQualifiedErrorId : CommandNotFoundException
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Manpreet SIngh KhatraConnect With a Mentor Solutions Architect, Project LeadCommented:
Exchange 2007: Create a new mailbox from the command line

- Rancy
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Is this being run from Exchange Shell ?
What Exchange rights does your account have ?

- Rancy
Thor2923Author Commented:
I am a domain admin. I logged into our Exchange CA server and opened the command promt and typed POWERSHELL. Is this not the Exhchange powershell??
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Nopes sir :)

GO to Exchange server and open Exchange Shell and run this from there :)

- Rancy
Thor2923Author Commented:
ok thanks, I got through it and now at least I know about the Exchange Shell! lol
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