We have a customer who when ever you update the Barracuda Message Archive Outlook Plugin it causes all users on the terminal server to get a prompt about forms scripting support. From what I have been able to find out the feature is not installed on a terminal server by default. So to fix this you need to run a command. To figure out the command you need to locate the correct MSOCache folder. This is of course post an install of Office 2013 Standard. Your install may be different then this
So here is the MSO Folder in the C:\MSOCache\All Users folders. If you look though all of the folders you can see that each one is a component of Office 2013. Take a note, there is only 1 with the GUID with 0000-0000 This is the one you want (the others have 0409)
Your GUID may look a bit different, but you are looking for the Office64ww.msi The command to run in the above example is as follows
msiexec /i {90150000-0012-0000-0000-0000000FF1CE} ADDLOCAL=OutlookVBScript /qb
When you run it, you will see office will run the update and now when you open Outlook there will be no error ?