Microsoft is keen to stir up enthusiasm for Windows Vista, but when it comes to the 64-bit edition of the recently released operating system, the software giant is sending decidedly mixed messages.

Vista is available in both 32-bit and 64-bit versions, with the latter targeted at owners of recent computers with 64-bit processors. However, customers who purchase the retail version of Vista Home Basic, Home Premium or Business don't have the option of buying the 64-bit version directly.

Instead, they have to purchase the 32-bit version and then order a replacement CD from Microsoft, for which they are required to pay a postage charge. The charge is described as "minimal" by Microsoft, but comes in at just under AU$15 for Australian users.

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Microsoft, Windows Vista, 64-bit