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Do you have access to both outlook (with the mailbox attached) and the external email address provider account? you could set up iMap in the outlook and drag all the files over. <br />
<br />
Otherwise this can't be completed with powershell. You can export the pst with powershell but then you can't import that into gmail/hotmail ect.<br />
<br />
Your best bet is to copy it - its also a lot easier.
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IF you have the ability to forward to an external address, it's a setting in Exchange, and you are using outlook you should be able to create a rule that does this for you.
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There is an option when creating a rule:<br />
<br />
Run this rule now on messages already in &quot;&lt;mail folder ex. inbox&gt;&quot;<br />
<br />
that you can place a check mark next to.
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<div class="content wysiwyg-content">
RE: Exchange 2010<br />
&nbsp; <br />
Is it possible to forward all e-mails that have already been delivered to a specific mailbox to an external e-mail address? Powershell?<br />
&nbsp; <br />
Thanks.
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RE: Exchange 2010
  
Is it possible to forward all e-mails that have already been delivered to a specific mailbox to an external e-mail address? Powershell?
  
Thanks.

How to forward all existing emails in Exchange mailbox to an external address?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

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