A recent project has me attempting to install Microsoft Project Server 2010 to a Windows Small Business Server 2008. SBS 2008 ships with SharePoint version 3.0, but Project Server calls for SharePoint 2010. Not only that, SharePoint 3.0 must be upgraded to Service Pack 2 before SharePoint 2010 can be installed.
I went to SharePoint Central Administration, went over to Operations, Clicked on Servers in the Farm and pulled the existing version number: 18.104.22.16835.
Then I ran across this useful link: http://www.sharepointdesignerstepbystep.com/Blog/Articles/How%20To%20find%20the%20SharePoint%20version.aspx. This allows you to match your existing Sharepoint version number with the Service Pack and Version. In this case, I am already running version 3.0, Service Pack 2.
With that done, I can follow the official guide to migrate from Windows SharePoint Services 3.0 to Microsoft SharePoint Foundation 2010 on a server running Windows Small Business Server 2008.