Offline files out of sync with live files

I have an issue on a Windows Vista Business laptop. The exact same scenarios
has worked very well with XP Pro in the past. User selects a network share to
"Make Available Offline". The files sync to the laptop. User disconnects,
edits file, reconnects and syncs fine. Now that the user is back on the
network and the status indicates online, if the user edits any file that is
available offline, it does not access the live, networked file. It appears to
access the offline version. When user saves the document (while still
attached to the network), Explorer indicated that the edited file is not
synced. Why is it that the connected laptop isn't working live?