Earlier today the Exchange CXP team released an updated version of Update Rollup 4 for Exchange Server 2010 SP1 to the Download Center. This updated release is being made available after a comple...
Updated Jul 01, 2019
Version 2.0
Blog Post
The update fixed some problems we were experiencing, for which my customers and me are very gratefull. :-) However, I did ran into a problem. After the update the webmail stopped working. The eventlog showed multiple event id's 116 with the following message:
"Outlook Web App failed to load the following theme folder: D:Program FilesMicrosoftExchangeClientAccessowa14.1.323.3themesgoth
The following files are missing: gradienth.png, gradientv.png, csssprites.css, csssprites.png, csssprites2.css, csssprites2.png"
Since the installation went fine on my test-server (a clone of the production server) I was able to copy the missing files from that machine, which solved the problem. The same issue occured in RU1 (or was it RU2?). I wasn't the only one experiencing that problem back then, but it seems that I'm the first one now.
The fix is easy, but perhaps you should look into why this happens on some machines.