[MiKTeX] what to do about old roots from 2.5?

[Peter H. <ph...@sp...>]

I just ran the installer for MikTeX 2.7 (WinXP).  I had 2.5 installed at 
the time.  I'm now seeing that the root structures of 2.7 and 2.5 are 
totally different.  Do I want to add the old root directories to 2.7's 
configuration, or just create a new 'localtxmf'-style directory for 2.7 
that contains my custom .sty files, then wipe out the old 'localtxmf' 
and 'texmf' directories, trusting 2.7 to download what it needs, as 
needed?  Hope this is a coherent question.

Thanks much.