Hi Mr Mike 2,
I suggest you check info at:
http://www.microsoft.com/windows/enterprise/how-to-buy.aspxand click on the link:
Learn about which operating systems qualify for a Windows 7 Professional Volume Licensing upgrade license.
http://download.microsoft.com/download/A/9/1/A9182CEC-8A2D-408F-864E-9E35B3CF1142/Qualifying%20Operating%20Systems%20for%20Windows%20Volume%20Licensing.xpsIf you have Academic license, my understanding is that you can upgrade to Windows 7 Professional or Windows 7 Enterprise, Volume License edition.
Here is info from the quoted xps document
<quote>
Each of these conditions must be met in order for a base PC to be eligible for an upgrade license:
· Software under the qualifying OS license must already be installed on the device that will be assigned the Volume Licensing upgrade. See chart below of pre-installed OEM versions that are eligible for upgrade.
· You must remove the existing qualifying OS from the device in order to deploy the Volume Licensing upgrade license, unless the PC is covered by Software Assurance.
· Customers who wish to install or run more than one licensed OS at one time (including the qualifying OS), may either:
o Acquire Software Assurance for their Volume Licensing upgrade license.
o Purchase full Windows 7 licenses, separately.
</quote>