Hey @Gerrit Deike
Is the license the same edition as the office on the server ?
Is it proper using MAK to activate Office for RDS server?
Here I quote from Licensing of Microsoft Desktop Application Software for use with Windows Server Remote Desktop Services,
might give you some inspiration.
"Microsoft licenses its traditional desktop applications such as Office Professional Plus on a per-device basis.
Per-device licensing means a customer must obtain a license for each desktop on or from which the product
is used or accessed."
"Use of Microsoft desktop applications in a Remote Desktop Services environment requires that the suite/edition,
components, language, and version of the license acquired for the desktops from which the desktop application is remotely
accessed matches that of the copy of the application being accessed.
For example:
• Product: Microsoft Office Standard 2019 and Microsoft Office Professional Plus 2019 are different products.
A desktop licensed for Office Standard 2019 may not remotely access and use Office Professional Plus 2019.
• Components: A license for a suite (for example, a Microsoft Office suite) for the accessing desktop must
have the same components as the copy of the Microsoft Office suite being remotely accessed.
• Version: Microsoft Office 2019 and Microsoft Office 2016 are different versions.
You may not remotely access the Microsoft Office 2019 from a desktop that’s licensed for Microsoft Office 2016.
Also note legal licensing questions are better directed towards your reseller's trained licensing specialist or ask microsoft directly.
https://www.microsoft.com/Licensing/servicecenter/Help/Contact.aspx
or email volume licensing service.
VLSC Support Center Contact Info
Best Regards and Happy New Year!
Karlie
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