If you installation failed with: Failure [0x80070005] Access is denied.

This is a problems with administrator rights.

Please check the following things:

1. The user need to be a domain user.
2. The user is member of: Domain Admins group and RTCUniversalServerAdmins group. (Remember to relogon after you have put the user in these group).

Then right click on the installation file:

\Setup\amd64\setupee.exe (For enterprise)
\Setup\amd64\setupse.exe (For standard)

And then click Run As, then run it without “Run this program with restricted access”

Now you should be able to installed the Office Communications Server 2007 R2