In an effort to get the remaining MobileMe customers upgraded to Lion and iCloud, Apple is offering a free upgrade to OS X 10.6 Snow Leopard for those still running OS X 10.5 Leopard.

Macgasm posted pictures of the missive, which directs MobileMe customers to this link. After signing in, those who need a copy of Snow Leopard can get an installation DVD after filling out mailing information. Snow Leopard retails for $29. Those who take advantage of the offer will still have to pay $29.99 to upgrade to Lion.

The Snow Leopard upgrade program expires on June 15, a couple weeks shy of MobileMe's shutdown date of June 30.