Tag Archives: OWA

Dreaded "Red X" with OWA in Exchange 2010

It appears that after applying Hotfix Rollup 2 in Exchange 2010 Service Pack 1 (and I’d wager this may be an issue in the future), some users are getting the following error in Outlook Web App:

exchange 2010 owa “Couldn’t find a base theme (folder name=base)”

…along with a bunch of Red X’s where the images should be.

Turns out the issue is that, for a variety of reasons, Update Rollup 2 installed with insufficient permissions to apply some settings.

In order to fix this issue, you need to right-click on Exchange Management Shell, select Run As Administrator, and then run the following command:

C:\Program Files\Microsoft\Exchange Server\V14\Bin\UpdateCas.ps1

After running that command, restart your server and OWA should work properly again.

EMS Command to Set Legacy Outlook Web Access in Exchange 2010

If you will be running Exchange 2003 & 2010 simultaneously with mailboxes in both environments, you’ll need to run the Set-OWAVirtualDirectory command on each CAS Server in your organization.  The command to run is:


Set-OWAVirtualDirectory -Identity "CASServer\owa (Default Web Site)" -Exchange2003URL https://legacy.webmail.domain.com/exchange

Simply change the relevant parts to reflect the settings in your environment.  This will tell Exchange 2010 OWA to redirect for clients with Exchange 2003 mailboxes to the appropriate OWA server.