Install base or install user 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. Although, the install base number is often created using the number of units that have been sold within a particular period. It isn't necessarily restricted to just systems, as it can also be products in general. 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.
Installed base is not the same as the total number of units sold at any given moment in time (cumulative sales numbers), since some of those units will typically be out of use because they have broken, gone missing, been made obsolete or replaced by newer versions.
... Consequently, the installed base of these systems is small ... The lack of a significant installed base may prove to be a substantial issue in the future of these systems ... Installed base is again a significant issue in matter of networking ...
... Market share is measured by browser hits, sales and installed base ... If measuring market share by installed base, there were more than 20 million Mac users by 1997, compared to an installed base of around 340 million Windows PCs ... The installed base of Mac computers is hard to determine, with numbers ranging from 5% (estimated in 2009) to 16% (estimated in 2005) ...
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