If you need to determine your WAC Server build, it is relatively easy. Paste the below command in Windows Powershell on the WAC Server:
You can also use the below methods if you have lots of time on your hands :)
Internet Explorer 11:
Browser to this URL: /op/servicebusy.htm">http://<wacservername>/op/servicebusy.htm (change the letters in red to reflect the wacserver name).
Hit F12 key (make sure the "F lock" key is selected). You will then see the below window.
1. Choose the "Network (Ctrl + 4)" icon.
2. Click the Play button "Enable network traffic capturing (F5)"
3. Click "Details"
4. Click "Response headers"
5. You will see the WAC build next to "MicrosoftSharePointTeamServices".
Internet Explorer 10:
Browser to this URL: http://<wacservername>/op/servicebusy.htm (change the letters in red to reflect the wacserver name).
1. Choose the "Network tab.
2. Click "Start Capturing"
5. You will see the WAC build next to "X-OfficeVersion".
The instructions for IE11 is incorrect, that's how you can estimate the SharePoint version (http://www.wictorwilen.se/sharepoint-mythbusting-the-response-header-contains-the-current-sharepoint-version).
The IE10 example is correct though, even though I prefer another method using PowerShell, http://www.wictorwilen.se/office-web-apps-server-which-version-is-installed.
Hello Anonymous! Thank you for your feedback. I have made the correct changes to properly reflect the WAC build. Wictor's blog is awesome. This is just another way to do it.