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Absolutely. &nbsp;Foundation server is limited to 15 users and must be the first domain controller in the domain. &nbsp;i.e. it must retain all FSMO rolls.
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Absolutely.  Foundation server is limited to 15 users and must be the first domain controller in the domain.  i.e. it must retain all FSMO rolls.

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Hello,<br />
I've just installed a 2012R2Foundation with Exchange2016. Works Fine...<br />
Customer has 9 windows user accounts in AD.<br />
Now get a message (translated from French) : License compliance check failed, because the server owns more than 15 local users.<br />
In fact, it looks like all 'SystemMailbox{1f05xxxxxxx<wbr />xxxxxxx} were taken into account even if these users do not match any physical users.<br />
From what I can see in Technet, such an error would *NOT* lead to server reboot.<br />
<br />
...<br />
Windows Server 2012 Foundation is limited to a total of 15 users in Active Directory. <br />
An error occurs when this number is exceeded. <br />
The server will not shut down as a result of this issue. <br />
For steps to remove user accounts from Active Directory Domain Services, see Delete a User Account (<a href="http://go.microsoft.com/fwlink/?LinkId=150361" rel="ugc">http://go.microsoft.com/fwlink/?LinkId=150361</a>).<br />
...<br />
<br />
Could anyone confirm this fact ?<br />
Thank for your help<br />
Francis
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Hello,
I've just installed a 2012R2Foundation with Exchange2016. Works Fine...
Customer has 9 windows user accounts in AD.
Now get a message (translated from French) : License compliance check failed, because the server owns more than 15 local users.
In fact, it looks like all 'SystemMailbox{1f05xxxxxxxxxxxxxx} were taken into account even if these users do not match any physical users.
From what I can see in Technet, such an error would *NOT* lead to server reboot.

...
Windows Server 2012 Foundation is limited to a total of 15 users in Active Directory. 
An error occurs when this number is exceeded. 
The server will not shut down as a result of this issue. 
For steps to remove user accounts from Active Directory Domain Services, see Delete a User Account (http://go.microsoft.com/fwlink/?LinkId=150361).
...

Could anyone confirm this fact ?
Thank for your help
Francis

2012R2 Foundation license compliance

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

license

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.