In case you missed it, Microsoft today announced Microsoft Office 365, Microsoft’s next-gen cloud offering, successor to BPOS. It contains Microsoft Office Professional Plus, SharePoint Online, Exchange Online and Lync online. You can watch the announcement on-demand here. Office 365, which is expected early 2011, will initially run Exchange 2010 at SP1 level.
You can sign up for the beta here. Note that the beta is limited and available in 13 countries only.