mailbox management clarification using powershell

I need clarification on mailbox management using powershell /exchange management shell/snapin. Can I run the exchange management snapin from an xp or win 7 workstation ( then run the exchange commands from my pc ), or do i have to be logged into the exchange server. I see some web pages that seem to indicate you can run the commands from your workstation.

http://www.itexperience.net/export-mailboxes-from-exchange-2007-with-export-mailbox/
http://www.exchange-powershell.com/2009/11/24/delete-all-messages-after-date-from-mailbox/

Also, assuming above is possible, how do i install the EMS on my workstation , and what is the best way to delete mail from a mailbox?. I tried using "Export-Mailbox reservations -deletecontent -enddate “09/01/2010" " from the mail server EMS to delete mail prior to  the date indicated in command, but the command goes through a "moving process" is this the best way? . Ideally , I would like to do the option in exchange-powershell.com link above to export to pst , but doing so on server results with" You are running on a 64-bit computer. To export to or import from a .pst file, you must be running a 32-bit computer that has Outlook 2003 SP2 or later installed."