No Outlook 2007 ou 2010, na aba Inserir da faixa de opções, você pode usar Partes Rápidas para inserir texto.
Consulte: Criar Blocos de texto reutilizáveis para mensagens de email
The Microsoft Office Outlook 2007 Quick Parts feature provides building blocks, reusable pieces of content or other e-mail message parts that are stored in galleries. You can access and reuse the building blocks at any time. You can also save building blocks and distribute them with templates so that other users can use the building blocks you created.