Existe um excelente artigo sobre o howtogeek. com que detalha como fazer isso.
Do you ever find it frustrating that you can’t make changes to the auto-complete entries in Microsoft Outlook? Even more annoying is the fact that items in your address book aren’t immediately added to the autocomplete list.
There’s a small utility named NK2View by the excellent Nirsoft that can help with this problem. You can delete items in the list, import from your address book, and even export auto-completed addresses for later import into Outlook as full contacts.
Faça o download do NK2View da Nirsoft , execute-o e use a tecla F2 para importar endereços do seu catálogo de endereços para o cache de preenchimento automático.
Eu testei com minha própria cópia do Outlook 2010 e funciona bem.