I am almost finished migrating from our old SBS 2003 server to a new Server 2012 R2 Hyper-V host with multiple Server 2012 R2 VMs. I used robocopy to copy all the shared folders from the SBS2003 to one of the new Server 2012 R2 VMs. It kept all the security stuff, all I had to do was share the new folders. This was pretty simple in the end.
The only share that I still want to move, but have not done, is the 'Users Shared Folders' (\\Server\Users). Because it is SBS, each user's My Documents folder is redirected to \\Server\Users\username.
I don't mind this concept and was thinking of keeping it on the new server, but I am not sure how to migrate it without having to manually change every users account settings. I can copy the data and security info easy enough (using robocopy) but don't know what to do about the folder re-directions.