Microsoft has confirmed that they will be releasing SP2 for Exchange server 2007 in the third quarter of 2009. Of the number of fixes it will provide, the most awaited option is the exchange backup plugin for windows 2008 server. Till now, backing up exchange 2007 using the 2008 server backup utility is not supported. They should have fixed it well before as most of the companies would have purchased a third party product or even their own DPM 2007.
Was that the plan? ;)