After setting up Exchange 2007 and config owa, I can logon to owa. Everytime I clicked on New, Send Item or Calendar, I got an message: Outlook Web Access encountered an unexecpted error and was unable to handle your request". I tried to logon by using different user account but the error was showed to everyone. It looked like I missed an need to do sometime in Exchange server 2007 to enable or giving the right permission. I assigned Intergrated Windows authentication and Basic authentication in owa (Default Web Site) properties. Please help. Thank you, Basler

What service pack are you running? Have you tried applying all of the rollups? Also, what Operating system are you running on?

My Exchange 2007 is SP1. What do you mean rollups? After installed Exchange 2007 SP1, I went to Microsoft to do Windows update. My Exchange server 2007 SP1 is installed in Windows 2008 64bits. It there anything to do with IIS7? Thank you, Basler

Buddy, you need to upgrade your exchange 2007 to SP2 and then apply the roll update 4.Raj

Hi Basler, Have you tested the problem in another computer? Does the problem happen immediately after seting up ex2007 and owa? Check configuration on IIS first. Default settings for Exchange-related virtual directories in Exchange Server 2007 http://msexchangeteam.com/archive/2008/02/01/447989.aspx If the issue persists, I recommend you reinstall IIS and exchange CAS role: How to remove and to reinstall IIS on a computer that is running Exchange Server http://support.microsoft.com/kb/320202

Hi Raj and Thomas, I will try to upgrade to SP2 then install roll update 4 first. If the problem is still happened. I will follow the instructions from Thomas. I will update my result. Thank you, Basler

Hi Raj, After upgrade to SP2 and update rollup4. My OWA is still have a problem with all of users that they still have a error message everytime they clicked on new, calendar, sent items. Do I ready need to reinstall IIS? Do I have any solutions? Thank you, Basler

I will suggest yes. Reinstall OWA and CAS role on the server.Raj

Try creating a new Virtual Directory for OWA. This TechNet article should help with that. http://technet.microsoft.com/en-us/library/bb124811%28EXCHG.80%29.aspx