This is from another Technet Social post:
When you make a network folder
available offline, copies of all the
files in that folder will be stored on
your computer's hard disk.
Windows 7 also, includes an expanded
ability to do fast remote queries of
file shares, including on Windows
Vista®, Windows Server® 2008, Windows®
XP with Windows Search 4.0 installed,
and earlier versions.
Client Side Caching as well as the
Offline File service have some
fundamental differences in Windows 7,
but, the dynamics of this process seem
to be the same. I'm not sure what
instructions you used to move the
cache file from Vista but depending on
the process, you may be able to use a
similar function when utilizing
offline folders in Windows 7.
Could you check if this knowledge base article is different from what you used before?