Are you finding any issues with running the server on 2008 R2 SP1?
The tech specs are available here.
Under System Requirements you will note:
Microsoft® Windows® Server 2008, 2008 R2, 2003 SP1 or higher, Windows® 7 on x86 or x64 chipsets, or Microsoft® Windows® 8 (see Note 1)
I agree it's a bit confusing, but I read the 'or higher' applying to the full listing of the windows server versions.
Hope this helps.
No I don't have Windows 2008 SP1 installed, yet on Tableau servers. I wanted to get confirmation from Tableau support/customers before I installed it. I didn't want to assume the System Requirements implied it was supported, and I couldn't find any specific reference to SP1 in the forums.
I confirmed with our test team that 2008 R2 SP1 is part of our regular testing matrix. So, it is supported.