Productivity takes a big step forward in Mango (via the WindowsTeamBlog)

During the TechEd keynote today we also showed a range of
additional capabilities in Mango that will help you reach a new level of
productivity. These include:

• Pinnable email folders: Pin a folder to the start screen for quick
  access. This could be an email folder for a specific project, from a specific
  group or person (like your boss), or an RSS feed you’ve set up in Outlook.
• Conversation view in email: Emails in your inbox are organized by
  conversation, bringing replies to a thread into a consolidated view so it’s
  faster and easier to stay on top of the conversation.

• Server search: Search your email server (e.g. Exchange Server) for
  older emails no longer stored on your phone, giving you ready access to
  all of your mail.
•  Lync: Lync Mobile brings the Lync experience to Windows Phone customers by
  delivering Unified Communications capabilities, including instant messaging and
  the ability to see the presence of your co-workers. The Lync app will be a free
  download from Windows Phone Marketplace and will be enabled with support from
  your business organization.