Installed base
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| Installed base is a measure of the number of units of a particular type
| of system (usually a computing platform) actually in use, as opposed to
| market share, which only reflects sales over a particular period.
| Because installed base includes machines that may have been in use for
| many years, it is usually a higher figure than market share. Many people
| see it as a more reliable indicator of a platform's popularity.
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http://en.wikipedia.org/wiki/Installed_base
Another form of disinformation is revenue-based assessment (e.g. server
sales), which does not indicate the level of actual growth for a platform
(hardware unit versus $$ unit, which can easily be -- quite artificially --
inflated).
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