Memory Usage on 2008 R2 file server is high and doesn't seem to be accounted for

this is a vmware vm running 2008 R2 server with file services with 8 GB of RAM at 95 percent usage.

The memory usage by processes doesn't add up to 7.5 GB and the active memory on the vm is only 1.2 GB.

I expect this behaviour in Exchange but not a file server.  Any idea why windows 2008 is reporting 95 percent usage.  The page file is 8.3 GB.

The memory\pages/sec is 205 on average.

Thanks!