Over at Neowin they have some interesting information on the Windows Phone 7 update that will come later this year.
Read the full article :http://www.neowin.net/news/wp7-mango-productivity-enhancements-detailed

• 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.

I am very curious whether all Active Sync funcationality will be supported & I am very interested to see how the Lync client relates to the unofficial client that released earlier this month