Outlook Web App didn't initialize. If the problem continues, please contact your helpdesk.

The following is an OWA error thats received while logging on. This may be result of corrupt OWA settings or a messed up IIS database.

Try the following steps to fix this:


Steps:
*Make sure you backup you data before performing the following steps


* Logon to EMS as Administrator
*Run CmdLet: Remove-OwaVirtualDirectory -identity "ExCASServerName\OWA (Default Web Site)"
where ExCASServerName is your Exchange server name
*On the affected CAS server Run the CmdLet: New-OWAVirtualDirectory -Name OWA -WebSite "Default Web Site"
*On the Authentication tab (OWA virtual directory) configure 'Forms based authentication' or the appropriate authentication as required
*Run IISREST /NOFORCE


This should take care of the problem