When you carry out a search within OWA using Exchange 2010 SP1 you receive the below error:
‘The action couldnt be completed. Try again later’
This problem is a result of installing/upgrading a multi-role server (a server that has the Mailbox, Client Access, and Hub Transport roles installed) to SP1 and then removing the Hub Transport and Client Access roles, thereby leaving the server with only the Mailbox role installed.
There is a symbolic link for each language referenced in the registry, HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ContentIndex\Language. The symbolic links (ActiveX CLSID of the class used) allow for word breaking and stemming for the locale corresponding to the language.
During the Exchange 2010 Service Pack 1 uninstall process for the Hub Transport role, setup removes the symbolic links, regardless of the fact that the Mailbox role is still present. The removal of the symbolic links causes the generation of content indexing files to fail.
Microsoft have provided a script to resolve this. Click here BUT firstly reboot your Exchange server and test OWA search again. If this does not resolve the issue, run the scripts documented in the link above and test again. If this does not resolve the issue, you may need to reboot the exchange server for changes to take affect.