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Every time Microsoft, developer of the world's most popular personal computer operating systems, comes up with a new version of Windows, computer users wrestle with the question of whether they should upgrade.
The answer, in short, is yes, if it's time to buy a new computer, which, by the way, will have Windows 7 preinstalled. But otherwise, no--it doesn't make a lot of sense for most users to upgrade an existing computer from Windows Vista or Windows XP to Windows 7.
Neither does Windows 7 provide a compelling reason to switch to the Apple Macintosh, despite Apple's compelling TV commercials. This decision is largely independent of the operating system and is based …