standalone = A BlackBerry server installed on its own server. As many people install BES on a mail server I needed to point out they shouldn't delete the mapi & cdo files (It was a “pointing out the obvious” comment).
Re: "does this mean you can't support 2003 and 2007 with the same BES server"
If you have Exchange Systems Manager 2003 installed on the BES server it will fully support Exchange 2003 but won't fully sync with Exchange 2007 (e.g. Calendar sync doesn't work). If you remove Exchange System Manager and install "MAPI Client and Collaboration Data Objects 1.2.1" it will fully support Exchange 2007 but will have sync issues with Exchange 2003 (e.g. Calendar sync doesn't work).