If multiple Express Editions are installed on the same computer and then one is uninstalled, the uninstall un-registers file extensions it has in common with the other Express Editions.

• 如果同一计算机上安装多个OutlookExpress版本并且再被卸载一个,卸载取消注册文件扩展名它必须与其他OutlookExpress版本相同。