Mac customers who placed their orders months ago for Mac OS X Snow Leopard 10.6 are expressing displeasure all over Twitter, because the Mac OS X Snow Leopard Up-to-Date program promised users who bought a qualifying Mac or Xserve on or after June 8th of this year an automatic upgrade from Leopard to Snow Leopard for only $9.95. However, it appears that Apple’s only shipping out full versions of the operating system upgrade, and not the Up-to-Date versions. "Expected Product Availability" on the Up-to-Date site now simply says "September 2009."