In Windows Vista offline files feature can be enabled in the following way.
- Click on Start button (Shortcut for this: Ctrl-Esc (or) windows key)
- Click on Control Panel
- Click on Network and Internet
- Click on Offline Files.
- In the General tab, click on ‘Enable Offline Files‘.
- Say continue if user account control asks confirmation.
Now you can see the offline files window in the below state. As stated below the ‘Disable offline files’ button reboot is required to make the changes effective.