1. The YArooms tab does not appear after installing the add-in
In Control Panel, go to "Add/Remove programs" and make sure the "YArooms Outlook Addin" program is installed. If not, please run the installer again.
In Outlook click the File tab, then choose Options on the left
In the newly open window choose the "Add ins" tab on the left
In the bottom of the tab select "Manage: COM Add-ins" and click Go
In the newly open Window make sure the "YArooms Outlook Addin" is present and checked
2. The "Room Booking" button is disabled
Make sure the appointment/meeting is not created in a shared calendar. Please see the "Booking in Shared Calendars" section above.
Make sure the user with which you are logged into YArooms in Outlook is the same user that created the original YArooms booking. If the user has changed in the meantime it may not have access to the Room booking functionality.