Outlook 2010 Contacts Search brings up multiple copies of contact

Take a look at these links Outlook Duplicate Causes and Prevention

Preventing Duplicate Contacts in Dynamics CRM and Outlook | eImagine Technology Group

Do they help?

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Duplicate contact issue occurs when you synchronized Outlook with another application. Please check following method to delete duplicate contacts:

1. Go to Contacts.
2. Click View, Current View and select Phone List.
3. Right-click a column header and select Field Chooser from the resulting menu.
4. In the Field Chooser box, use the dropdown and select All Contact fields.
5. Select Created.
6. Drag Created to the Column Headers to add it to the list. Close the Field Chooser box.
7. Now click on the newly added column header (Created).
8. Scroll down to the first contact in the list that is to be deleted and select it.
9. Scroll down to the last contact that is to be deleted. Hold down the Shift key and select this contact. This will highlight all of the contacts that you are going to remove.
10. Press the Delete key. The duplicate contacts will be removed.

I suppose its one person with the same name and email address. You can hit down key and hit delete them and keep only one you want.

I use Outlook 2013 but I think they are similar. Open Outlook, select File, then Options & in Options select People & see if the Check for Duplicate Names is selected. See attached screen shot.