Upgrade SQL 2008 Standard OEM to SQL 2008 R2 Standard Volume License

I have a windows server running an OEM (off the shelf boxed copy) of SQL 2008 Standard. I need to upgrade this copy to SQL 2008 R2, which I will be doing using downgrade rights from a copy of SQL 2014 Standard that I have through Volume License.

All of the references I have found point to the upgrade process needing a product key for installation, which is not provided in the VLSC. Has anyone had experience using the 2008 to 2008 R2 upgrade tool in the SQL Server 2008R2 installer to perform this? I called Microsoft and they said that I would need to uninstall the OEM copy and install the volume license copy fresh, which will not prompt for a product key.

Any assistance is greatly appreciated.
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You have a registration for the VLCS, you have to go to Ms licensing server and upon registering an account with your VLCS purchase, you will have the Key you need.

Search for VLCS Microsoft for the link

The purchase receipt should include this information. Contact tge reseller through whom this was purchased.
scisupportAuthor Commented:
As it turns out, the upgrade worked with the burned in key in the VLSC installer.

In the VLSC portal, no keys are listed for SQL Server (see below), I called and verified this with MS Support as being correct. They advised that the key is somehow built-in to the installer, so no additional key was needed.

Interestingly, the MS support rep also said that we would need to uninstall the OEM version to avoid being prompted for a key. This was not the case.
EugeneZ ZhitomirskySQL SERVER EXPERTCommented:
if your MS licensing agreement (VLSC) is still valid
you do not need to do anything as long you payed for your SQL 2008 R2 license: just upgrade...

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Microsoft SQL Server 2008

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