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Not what I wanted to hear but what I thought was the answer from my own research.
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Not what I wanted to hear but what I thought was the answer from my own research.

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I have a 2008r2 Foundation server that I need to do a 2 way Trust to another domain. &nbsp;The os has informed me that this function is not allowed under Win2008r2 Foundation. &nbsp;<br />
So now I have to do an inplace upgrade to 2008r2 Standard using:<br />
DISM /online /Set-Edition:&lt;edition ID&gt; /ProductKey:XXXXX-XXXXX-XX<wbr />XXX-XXXXX-<wbr />XXXXX <br />
I have since found out that DISM does not work on a AD DC. &nbsp;So &nbsp;now what do I do. &nbsp;If I demote the DC dont I loose all my AD and Settings and Why would you have a Member DC on a 10 User network to move FSMO roles to. &nbsp;<br />
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So in My situation is an InPlace upgrade even an option? &nbsp;If it is How. &nbsp;It is a full production network so I cant be down for days rebuilding.
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I have a 2008r2 Foundation server that I need to do a 2 way Trust to another domain.  The os has informed me that this function is not allowed under Win2008r2 Foundation.  
So now I have to do an inplace upgrade to 2008r2 Standard using:
DISM /online /Set-Edition:<edition ID> /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX 
I have since found out that DISM does not work on a AD DC.  So  now what do I do.  If I demote the DC dont I loose all my AD and Settings and Why would you have a Member DC on a 10 User network to move FSMO roles to.  

So in My situation is an InPlace upgrade even an option?  If it is How.  It is a full production network so I cant be down for days rebuilding.

InPlace upgrade 2008r2 Foundation server to Standard

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.