Windows Vista Ultimate

Windows Vista Ultimate combines all the features of the Home Premium and Enterprise editions, plus "Ultimate Extras". 64-bit Ultimate supports 128 GB of RAM.Microsoft released two notable variant versions of Windows Vista Ultimate: Windows Vista Ultimate Upgrade Limited Numbered Signature Edition, and Windows Vista Red. The Signature Edition featured Bill Gates' signature on the front of the packaging along with a unique number; the edition was limited to 25,000 copies. Windows Vista Red was a version released to raise awareness of AIDS in Africa. This edition was available pre-installed on select Dell computers and also through The Ultimate Steal.