今天使用OWA邮箱，登录后突然看到如下错误。
The ActiveX control needs to be enabled in Internet Explorer for Outlook Web App to work correctly
然后打开IE->Tools->Internet Options->Security选项卡，点击【Internet】->【Custom Level】。
然后开启如下选项即可。
Download signed ActiveX controls
Run ActiveX controls and plug-ins
Script ActiveX controls marked safe for scripting
