Make sure you've activated the MSSQL extension in your php.ini. I don't know this script, but often installers first detect which database extensions are available and let you only use these.
So find your php.ini and search it for something like this:
extension=msql.dll
If you can't find the line, add it to the file (maybe restart your webserver) and try again.
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Roundcube 安装程序未检测到 mssql！
在安装 php 的 ms sql 驱动程序时选择使用 mysql 选项。
有一个完整的安装指南 http://www.ifunky.net/Blog/post/How-To-Install-RoundCube-With-hMailServer-and-Windows-2008-IIS7.aspx
Roundcube installer doesn't detect mssql!
Select with mysql option while you are install ms sql driver for php.
there is a complete installation guide http://www.ifunky.net/Blog/post/How-To-Install-RoundCube-With-hMailServer-and-Windows-2008-IIS7.aspx
确保您已在 php.ini 中激活 MSSQL 扩展。我不知道这个脚本，但安装程序通常会首先检测哪些数据库扩展可用，然后只让您使用这些扩展。
因此，找到您的 php.ini 并在其中搜索类似以下内容：
如果找不到该行，请将其添加到文件中（也许重新启动您的网络服务器），然后重试。
Make sure you've activated the MSSQL extension in your php.ini. I don't know this script, but often installers first detect which database extensions are available and let you only use these.
So find your php.ini and search it for something like this:
If you can't find the line, add it to the file (maybe restart your webserver) and try again.
这是因为 Roundcube Installer 无法检测 MSSQL，但您可以在没有安装程序的情况下安装/运行它。
It's because Roundcube Installer doesn't detect MSSQL, but you can install/run it without Installer.