Short answer: when you buy a Lenovo machine.
The editor of Consumerworld.org and Mouseprint.org, Edgar Dworsky, has found that some computer makers are charging “shipping, handling, and fulfillment fees” after Microsoft promised customers free upgrades to Win7 when they purchase PCs with Vista installed.
Microsoft began the Windows 7 Upgrade Option Program in June and said those who purchase a machine between June 26, 2009 and Jan. 1, 2010, will get the upgrade free.
Some manufacturers are giving the new OS free to some customers and charging others varying amounts from $11.60 to $17, Dworsky said.
See Computerworld story here for a list of who charges what.