This is what comes up when I try and go to webbased outlook. any ideas? HTTP Error 500.0 - Internal Server Error Calling LoadLibraryEx on ISAPI filter "C:\Program Files\Microsoft\Exchange Server\ClientAccess\owa\auth\owaauth.dll" failed <fieldset><legend>Detailed Error Information</legend> Module IIS Web Core Notification Unknown Handler AboMapperCustom-88333 Error Code 0x800700c1 Requested URL http://10.240.116.1:80/exchange Physical Path \\.\BackOfficeStorage\cmha-east.on.ca\MBX Logon Method Not yet determined Logon User Not yet determined </fieldset> Thanks, Peter Labelle

Open IIS Manager, go to application pools, select the one used for OWA, right click sele ct advanced properties, Set enable 32 bit applications to True, restart IISWith kind regards Krystian Zieja http://www.projectnenvision.com Follow me on twitter My Blog

I have done as you said. enable 32 bit applications was already set to true. under general I have .NET Framwork version = V2.0 Enable 32 bit applications = True Managed Pipeline mode = Classic Name = MSExchangeOWAAppPool Queue Length = 1000 Start Automatically = True Any other Ideas? Peter

Hi Peter, Make sure you use 32 bit dll for 32 bit application pool, and 64 bit for 64 bit application pool. After confirm your setting is right, please have a look for this similar threads, hope can give you some help: Thread: HTTP Error 500.0 - Internal Server Error in owa http://forums.iis.net/t/1163198.aspx exchange 2007 sp1 kills my iis application how to fix? http://forums.iis.net/t/1149050.aspx I also suggest you paste the related information (in your event log) in your next post. Thanks, Evan Liu TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

UPDATE ok If i change these two isapifilters in the applicationhost.config it fixes my problem. <isapiFilters> <clear /> <filter name="Exchange OWA Cookie Authentication ISAPI Filter" path="C:\Program Files\Microsoft\Exchange Server\ClientAccess\owa\auth\owaauth.dll" enabled="true" preCondition="bitness64"/> <filter name="Exchange ActiveSync ISAPI Filter" path="C:\Program Files\Microsoft\Exchange Server\ClientAccess\sync\bin\AirFilter.dll" enabled="true" preCondition="bitness64"/ /> </isapiFilters> I needed to add a bitness64 precondition

I have resolved the owaauth.dll" and AirFilter.dll" erros by adding the bitness64 precondition to the applicationhost.config file. now if I go to http://10.240.116.1/owa/ it asks me to login then throws up a blank page with a blue line down the left side of the page. where the separator between mail folders and emails would be. if I go to localhost/exchange i get what is below. any ideas? HTTP Error 500.0 - Internal Server Error The page cannot be displayed because an internal server error has occurred. Detailed Error Information Module IsapiModule Notification ExecuteRequestHandler Handler AboMapperCustom-88333 Error Code 0x800700c1 Requested URL http://10.240.116.1:80/exchange Physical Path \\.\BackOfficeStorage\cmha-east.on.ca\MBX Logon Method Negotiate Logon User cmha\labellep

Hi Peter, For this issue, I suggest you follow these steps to troubleshoot the problem: 1. Please follow this kb to check for your issue (resolution 4). Error message when you visit a Web site that is hosted on IIS 7.0: "HTTP Error 500.0 – Internal Server Error" http://support.microsoft.com/kb/942031#top 2. Since you have changed “Enable 32-Bit Applicantions” to true, I suggest you change it back and then check for the issue. (restart the IIS after you change the value) Thanks, Evan Liu TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.