Hello,  
  
May be it would be usefull for someone. I've found a solution for one of  
  
"OMA blank page" problems.  
  
I have Exchange 2003 SP1 on Server 2003 and  
  
Windows Sharepoint Team Services installed.  I can use OWA fine but when I  
  
go to the OMA  
  
address I get prompted for my login, and then I get a blank page. I've found  
  
an event: 1503:  
  
---------------------------------------------  
  
An unknown error occurred while processing the current request:  
  
Message: File or assembly name System.Web, or one of its dependencies, was  
  
not found.  
  
Source: mscorlib  
  
Stack trace:  
  
at System.Type.GetType(String typeName, Boolean throwOnError)  
  
at System.Web.Configuration.HandlerMapping..ctor(String requestType, String  
  
path, String typeName, Boolean defer)  
  
at System.Web.Configuration.HttpHandlersSectionHandler.InternalCreate(Object  
  
parent, XmlNode node)  
  
Message: File or assembly name System.Web, or one of its dependencies, was  
  
not found. (C:\Program Files\Exchsrvr\OMA\Browse\web.config line 430)  
  
Source: System.Web  
  
Stack trace:  
  
at System.Web.Configuration.HttpConfigurationRecord.Evaluate(String  
  
configKey, SectionRecord section)  
  
at System.Web.Configuration.HttpConfigurationRecord.GetConfig(String  
  
configKey, Boolean cacheResult)  
  
at System.Web.Configuration.HttpConfigurationRecord.GetConfig(String  
  
configKey, Boolean cacheResult)  
  
at System.Web.HttpApplication.GetHandlerMapping(HttpContext context, String  
  
requestType, String path)  
  
at System.Web.HttpApplication.MapHttpHandler(HttpContext context, String  
  
requestType, String path, String pathTranslated, Boolean useAppConfig)  
  
at  
  
System.Web.MapHandlerExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute()  
  
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&  
  
completedSynchronously)  
  
For more information, see Help and Support Center at  
  
http://go.microsoft.com/fwlink/events.asp.  
  
----------------------------------------------  
  
I just removed all carriage return characters in line  
  
<add verb="*" path="*.aspx" type="System.Web.UI.PageHandlerFactory,  
  
System.Web, Version=1.0.5000.0, Culture=neutral,  
  
PublicKeyToken=b03f5f7f11d50a3a" />  
  
in C:\Program Files\Exchsrvr\OMA\Browse\web.config file and it did help.  
  
Best regards,  
  
Vit Knyshevich.