SYMPTOMS
After the AxCMS is installed you go to Management System and get the error popup window like on screenshot bellow. Also silverlight upper management-ribbon is not available

CAUSES
Silverlight MIME types are missing.
All MIME types needed to support Silverlight are implemented by default in Windows Server 2008 / 7 IIS 7 and Windows Vista SP1 / Windows 7. Windows Vista RTM customers should add mime types by running "IIS Manager", clicking on "Mime Types", then clicking "add" and adding the following mime types
.xaml application/xaml+xml
.xap application/x-silverlight-app
.xbap application/x-ms-xbap SOLUTION
IIS 7 users: Getting Started under IIS 7.x
IIS 6 users: Getting Started under IIS 6.0
APPLIES TO
AxCMS.net versions: 9 and newer
IIS version: 7.x, 6.x