A really quick way to do this is to click on the start button and type the email address or name of your contact. Click on 'see more results' and you'll be presented with a window containing every email to or from that person.
Click on the 'Folder' tab in Outlook and select 'New search folder' in the top bar. When the dialogue box opens, click on 'Mail from and to specific people' under the 'Mail from people and lists' heading.
Click on the 'Choose' button and select the person from your list of contacts. Now click the 'From or sent to' button at bottom left, and the name of the person will appear in the text box.
Click on OK and then on OK again, and a new folder with the contact's name will appear in your personal folder list. In it will be all the emails you're looking for.
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