By Don Clark (Wall Street Journal)
Microsoft Corp. this week is disclosing new details of its plans to take on VMware Inc. and others in a hot field called virtualization.
The software giant's moves include the purchase of a Silicon Valley start-up called Calista Technologies Inc. Terms of the purchase aren't being disclosed.
Microsoft is also relaxing some licensing policies to allow use of virtualization software with more versions of its Windows Vista operating system and is lowering some fees associated with using the technology.

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