Of all the features in Outlook 2010, notes are by far the easiest to use. You create notes in the Notes folder. To open this folder, click the Notes icon at the bottom of the Navigation pane.
If you have several contacts who work for the same company, you can use an existing contact entry to create a new entry. Simply select the existing entry in your ‘Contacts’ view, click New Items…
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If you determine that you need to add more information, you can always add a column or row to your spreadsheet.