OV Subscription and M365

Hi Microsoft Community, 

at the Moment we the following situation with one of our Customers from Germany.

The customer has two differrent types of contracts at the Moment, one is a M365 contract and the other one is an Open Value Supscription  contract. As an attachment to this E-Mail i share the actual licenses of the Customer with you. 

The customer has the follwing licenses: 

M365: 

1x Dynamics 365 Customer Voice for Teachers

200x Microsoft 365 A3 for Teachers

5600x Microsoft 365 A3 for Students 

5x Microsoft 365 A5 for Teachers

100x Microsoft Teams Telefon Standard for Teachers 

25x Microsoft Viva-Suite for Teachers 

5x Planner for Project Plan 3 for Teachers 

3x Planner for Project Plan 5 for Teachers 

OV- Subscription: 

200 FTE; MS Core CAL Client Access License Suite, incl. Software Assurance.

2x MS Exchange Server Standard, incl. Software Assurance.

200 FTE; MS Project Professional incl. Software Assurance

200 FTE; MS Visio Professional Enterprise Device, incl. Software Assurance

25x MS Windows Remote Desktop Services User CAL

1x MS SQL Server Standard Edition, incl. Software Assurance

2x MS SQL Server Standard Core, incl. Software Assurance, 2 Licenses 

320 Cores; MS Windows Server Standard, incl. Software Assurance

48 Cores; MS Windows Server Datacenter Core incl. Software Assurance

The customer is a school and can participate at the Microsoft Education programm. Since the last partner of the customerdidnt do a good consulting job and wasnt able to answer the questions of the customer properly, he is now very sensitive about some questions he has. Maybe you can help us with those questions too: 

• With the Microsoft 365 A3 License for Teachers or Students there also comes a Windows 10/11 Desktop Operation System Upgrade to Windows 10/11 Education/Enterprise. Is there a proper Operations system like Windows 11 Pro OEM needed to install the Windows 11 Education Edition on the PCs or can the customer also buy Systems without any Microsoft Operation Systems and install the Windows 11 Education license directly on the Device? 
• To open up a Open Value Subscription Contract there are qualified Products needed. In this case its the Microsoft Core CALs. Are they always needed or is it possible to open a Contract without them? Cause the CALs would already been licensed about the Microsoft 365 A3 Licenses. 
• Is it still true, that when you License all FTEs in a Open Value Subscription contract that you can Provide all those Licenese for the Students too, for example: Visio, Project, Windows Server?
• If yes, how can the Students get those licenses? Is there still a Microsoft Portal where they can sign up with their school account and can Download those Licenses? 

Thanks for your help. 

Best regards 

Christoph