Compared to the behemoth task of manually upgrading a user base with a locally installed application, the effort required to upgrade users with a thin client application is minimal.

相对于本地安装的应用程序需手动为用户群进行升级的巨大工程而言，利用瘦客户应用程序为用户升级的工作量要少得多。

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Microsoft is doing what it always does: focusing on its massive installed base of users and ignoring the rest.

微软一如既往地专注于它巨大的安装基数而忽略了其他的。

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UNIX already had an installed base of about a 250,000 users.

安装unix的用户数达到了250,000。

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Nokia must subsidise game development for a year or two, as games are not profitable until there is a large installed base of users.

ECONOMIST: Mobile gaming

At the same time, the installed base of Symbian users will continue well after the last Symbian smartphone ships.

ENGADGET: IDC: Android claims 75 percent of smartphone shipments in Q3, 136 million handsets sold

Building reach to engage with a large enough installed base of BB10 active users will take time and requires Blackberry to overcome its branding challenge in the US and Europe.

FORBES: BlackBerry 10 Provides Slim Hope For BlackBerry