AWS Remote Desktop Services Licensing

Question

Greetings! This is my first to post, so please bear with me.
Here is my scenario:
My company has a number of Windows servers (company-owned hardware & OS licenses) in a server farm. My company has purchased User & RDS User CALs for all employees to be able to RDP into each server. Server licenses & CALs are all retail purchases,
no Volume Licensing, no Software Assurance.
The company has also purchased a VL w/SA Microsoft Office w/100 seats. I have installed Office on our servers for our users' use. 
I know this configuration is compliant with Microsoft's License Agreements as we own the hardware and directly purchased the licenses.
However, in addition to the server farm, my company has an account with AWS and wants to create several multi-user (via RDP) servers. Also, my company wants to install Office on the servers for our users.
Here is my problem:
I cannot find clear concise documentation from either Microsoft or AWS confirming the licensing requirements for my AWS scenario.
I've found many blogs saying one could use the regular User/RDS User CALs purchased via VL or Retail.
Alternately, I've found several other blogs talking about User/RDS User SALs (Subscriber Access Licenses) as the requirement since Windows is licensed from Microsoft via AWS through SPLA (Subscriber Provider License Agreement). 
Are SALs included in my monthly payments to AWS? Where do I buy SALs? Does anyone have official documentation from AWS on this topic? The software vendor from which I purchased my company's VL Office has never heard of SALs.
Additionally, I have not been able to find clear documentation regarding the use of Office on an AWS Windows instance. I know AWS supports LM (Licensing Mobility) for users with certain Volume Licensing agreements but LM only applies to Server Applications.
Microsoft Office is a desktop application.
Where can I buy Office for AWS instances? How do I license my users to be able to use Office on an AWS instance?
I've contacted Microsoft and was redirected to AWS. I've contacted AWS but no one seems to know the answers. Is no one else asking these questions? Is no one else using AWS Windows-based servers in a multi-user environment over RDP?
Any input on this topic would be very much appreciated.

Answer 1

I'm doing some licensing audits now and the only thing I've found was a webinar by AWS dated February 27, 2012, so I don't know if it's still the most current information. Due to the fact that the Windows Server license is being offered through Amazon
you would need a SAL in order to legitimately use any Remote Desktop Services, once you buy a SAL any existing user CALs you already have are now valid in AWS. The presenter goes on to say that Amazon would really like to offer SALs, BUT, unfortunately they
do not. This then lead me to alternating paranoid speculation that Microsoft has put Amazons request to sell SALs into the nearest round file so that Azure would be more attractive and a superiority complex rampant with bitter hatred for Amazon's inability
to make money that they would really like to make.
There were a couple of things that seemed kind of odd about this to me. Any existing Server CALs you have are "instantly valid" for use in AWS, but you're RDS CALs are not. It seems to me since the non technical use of those licenses are nearly identical
they should either both be valid or both be invalid for AWS use, so I guess this puts one more point in the hooray Microsoft column.
Apparently I can't post links yet, but there is a page with some references to License Mobility in AWS and a link to the webinar at the bottom in the Licensing & Costs section. The page is aws dot amazon dot com slash Microsoft and the remarks regarding
the RDS licensing are at the 15 minute mark of the webinar. Overall the webinar was generally more useful and less marketing than the page it's on, so if you plan to do anything with SharePoint, SQL Server or any other products it would be worth watching.
Also, Amazon says there is no way to run any version of Microsoft Office in an AWS instance legally, maybe you could get by with Open Office? If you do find a way to run any RDS applications in AWS legally I would be interested to hear about how.