I know this reply is a little old but I thought I'd add my solution to this problem.
I moved user's home drives, their my documents were re-directed to h: drive setup for offline sync via Group Policy, with encryption enabled.
the solutions above did not work for me and took and very long time (particularly trying to take ownership of the files).
As is turns out, none of that is necessary.
To access the offline files from the 'old' network location...
Open the currently Offline Files location and click into any sub-folder.
Then in the address bar of explorer where is says...
e.g. "Libraries\Documents\Folder Name"
- click in the white space next to it and it will resolve to the Offline UNC path
eg. "\\Servername\Sharename\username\Folder Name"
For me this was now pointing to the new offline file location of their home drive on the new server.
To access the Offline Files of the Old offline location all I needed to do was Manually edit that UNC path.
e.g "\\OLDServername\OLDSharename\username\Folder Name"
Once there you should now be looking at the offline version of the old server/folder path. you can now edit the folder to the Highest Parent Folder and ALL the offline files are now visisble.
This allows FULL access to all the Files and they can be copied, moved and edited from here...
I then use a simple Robocopy script to move those files to a new location (it will copy files that in the DB but Synced ad 0 space files, Offline that that have not been synced will copy in full, no problem)
e.g.
robocopy Source Destination /MIR /W:0 /R:0
/MIR - be careful this will do a mirror copy - any files in the destination folder that don't match will be permanently lost. so recover to a clean new empty Folder.
/W:0 /R:0 = don't wait and don't retry - without this the process will take forever on 0KB file links and wait 30 seconds for a retry.
robocopy "\\OLDServername\OLDSharename\username\" "c:\recovered" /MIR /W:0 /R:0
once that is finished do a search in the destination folder for any/all files that are empty and Delete them.
What you will have is the offline files you need (there will be some legacy 0kb files that search does not pickup, so if merging with a destination folder be careful of the warning of overwriting any distination files, if you're not sure choose the Keep both option when copying/moving...
that's it.
Hope it helps.
