The following configuration changes need to be made on the Siebel Application Server for each Siebel installation, so that it knows the capabilities of the IE8 browser. This configuration step is mandatory for all Siebel versions whenever IE8 is used in any environment, regardless of patch level:

1.Go to SiteMap (shortcut: control+shift+A)
2.Click on Adminstration > "Web Browser" > Browsers
3.Create a Browser with name : MSIE 8.0
4.For the browser add the following capabilites
oUser-Agent -- Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0)
oParent-- IE 8.0
oAccept-- image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, */*
oJumpTab > True
5.Create another browser with name: IE 8.0.
The capabilites for this will be the same as those displayed for the IE 6.0 browser; only the version will change to 8.0
6.Reload all Siebel Application servers