Microsoft also said a new version of its Exchange e-mail server will be available for purchase in the second half of 2009. When paired with the next version of Microsoft's Outlook e-mail program, Exchange 2010 aims to prevent e-mail faux pas and would warn people against trying to "reply all" to a huge distribution list. Microsoft said it can also be tweaked to stop people from sending e-mail outside the organization, helping businesses cut down on unnecessary e-mail and prevent leaks.