Body
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Load Outlook
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Click on File
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Select Account Settings→Account Settings…
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Your email account will be listed, double click on this
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In the next window that pops up select More Settings…
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Click on the Advanced tab.
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Click on the Add… button
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Enter the username
in the Add mailbox field
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Click OK
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Click Apply, Click OK
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Click Next, click Finish
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Click Close
This new mailbox will show up as a new Mail folder under your existing mailbox.