Upgrade server to base lion then to lion server?
The facts:
I have an Xserve running 10.6.8.
I want to upgrade it to 10.7 server.
We use institutional content codes to purchase via the Mac App Store.
Do I need to separately redeem a code for Lion and a code for Lion Server to upgrade?
Do I then install Lion server, or must I first install Lion desktop and then install Lion server?
I tried redeeming a code for Lion server and then when I went to install it is told me I needed to buy Lion desktop and quoted me a price, which is not our institutional price.
I have not found solid documentation yet on how this is supposed to work.
Any pointers?
Xserve, Mac OS X (10.6.8)