Powershell not accepting Get-Mailbox -identity command?

Hi,

For some odd reason, my servers are not acception basic -identity commands..

Output below:

[PS] C:\Windows\system32>get-mailbox -Identity user@domain.com -RemoteArchive
The operation couldn't be performed because object 'user@domain.com' couldn't be found on
'LOCATIONDC01.DOMAIN.local'.
    + CategoryInfo          : NotSpecified: (:) [Get-Mailbox], ManagementObjectNotFoundException
    + FullyQualifiedErrorId : [Server=EXCHANGE02,RequestId=125108c0-675f-4fae-8b86d04252350a,TimeStamp=21/07/2014
   15:39:43] [FailureCategory=Cmdlet-ManagementObjectNotFoundException] 7F33ADA2,Microsoft.Exchange.Management.RecipientTasks.GetMailbox
    + PSComputerName        : EXCHANGE02.DOMAIN.local

I have edited the domain names etc but you get the idea... why is this not working?

Thank you in advance