WebEx: How To Convert a Standard Outlook Meeting into a WebEx Personal Room Meeting
KB0010889
Option 1:
#1. Open the existing Microsoft Outlook Calendar invitation.
...
If using a room along with @webex, separate them by a comma in the location field (Ex: A-101; @WebEx).
#3. Click Send Update.
Option 2:
You must have Webex Productivity Tools and Webex Desktop App installed prior to following these steps.
...