Upgrade Windows 2008 R2 to SP1 with Exchange 2010 SP1 already installed

Hello,

We are currently running Exchange 2010 SP1 on Windows 2008 R2.

I know Exchange 2010 SP1 on Windows 2008 R2 SP1 is supported but I m not talking about "from scratch/fresh" installation.

The question is : can I apply Windows 2008 R2 SP1 on Windows 2008 R2 given it's already running Exchange 2010 SP1 on top ? (is it supported to apply the OS SP when an Exchange installation already exist ?)

Thank you,

H