The beta versions of the 2010 Office and SharePoint product range have been out for a few weeks now and people start running into issues (that’s what a public beta phase is for).
One of the issues with SharePoint Designer 2010 is that this version will not allow editing of SharePoint sites running on WSS 3 or MOSS 2007. That is very unfortunate but it seems there is no way around it.
So the next question is what you need to do so that you can continue working in both environments WSS 3/MOSS 2007 as well as SharePoint 2010. Matt Groves read the documentation and found out what Microsoft has to say:
SharePoint Designer 2010 only connects to SharePoint 2010. To connect to SharePoint 2007 and earlier sites you must continue to use SPD 2007. If you elect to install both applications side-by-side, you must download the 32-bit version of SPD 2010. Please also note that 64 bit Office applications will not run if SPD 2007 is installed; 64bit Office 2010 applications should only be used if not connecting to SharePoint 2007 servers.
Note to self: We are moving from a 32-Bit into a 64-Bit world and installing new software from now will take some more planning than just download and start Setup.exe.
Further ressource: The Microsoft SharePoint Designer Team Blog
