What I am saying is that RDS user profiles are running on the server not on your workstation. Therefore, they are like a new machine and you will need to have a license to run Office in that environment if you want Excel Direct to work. In that case you will need to order Office licenses per user when you order the server and RDS licenses.
My assumption is that your workstations have OEM licenses on the local machines and not open licensing by user (since you said it's 2007). If you did in fact have user licenses, you would be paying annually for the right to upgrades for Office and the licenses are not tied to the physical machine, much like your Adagio renewals entitle you to upgrades and allow you to move it to new equipment when the old is replaced.
All that being said, MS Office pricing schemes have changed a lot with the advent of 365, etc. And I'm not aware of all those changes and you should consult an expert that sells the licensing. They should be able to explain the pros and cons of the different pricing.
The important thing to know, from a functional standpoint, is you can continue to use your Office on the local machines without buying new Office licenses for the RDS. But you won't be able to use any office applications inside the RDS profile where Adagio will be installed and thus Excel Direct won't work unless you install Open Office and configure it.
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Dan Desautels
DezTek Solutions Inc.
Thunder Bay, ON