Outlook 2010 , ainda em versão beta, tem um novo Visualização de conversa, conforme descrito aqui :
Manage large volumes of e-mail with ease
Conversation view in Outlook 2010 improves the tracking of e-mail conversations—reducing information overload—and helps you manage large amounts of e-mail with ease. Entire conversations can be condensed and categorized with a single click. And, new conversation management tools enable you to save valuable inbox space by turning dozens of e-mails into just a few conversations using the Clean Up feature. Or, use the Ignore feature to send the entire conversation to your Deleted Items.
É claro que uma versão Beta não se qualifica como "estável", embora tenha sido muito estável até o momento.
Ele suporta, é claro, recuperar e-mails do Gmail:
You can easily manage e-mail messages from multiple mailboxes. Synchronize multiple e-mail accounts from services such as Hotmail, Gmail, or just about any other provider to Outlook 2010. Improved connectivity with Microsoft Exchange Server supports the use and management of multiple Exchange Server e-mail accounts in one location.