There are multiple ways to find the OWA 2013 patch or build level:
On an Office Web Apps Server, check the OfficeVersion.inc file located here
You can also check the X-OfficeVersion header value right from the browser. Please head over to my colleague Tom's blog post here.
not sure this works the way you are expecting. on several upgraded farms, I've checked this registry key and it is still set at the RTM version. so far the only reliable method I have been able to use is to look up the kb listed in "programs and features\view installed updates"
Agree with coolhand - installing SP does not change reported version
The script does not work if you installed WCA and then patched it! i have run this on 2 of my WCA farms with the March 2013 CU and it is showing the RTM version 15.0.4420.1017
It may work for slipstreamed installs but it doesn't give you the WCA patched version for upgraded WCA servers/farms.
Sorry, I didn't read coolhand's comment!
Run this command in Powershell to get version number.
Thank you all for your feedback, I have updated this post with more reliable ways to find the current WAC build number. Thanks to Tom S. and Joe Rodgers for their input.
Hi Sammy,Any ideas how the determin Office Web Apps install service pack version?Thank you!
@ AD-SPbb, if you do a reverse internet search on the build number, you should be able to determine the CU or service pack level, for example my build number is 15.0.4481.1508 which is OWA April 2013 CU.