Greetings to all
I follow the developments of zimbra for a few years and I have made ​​some test installations on Small Machines.
My company has provided me a hosted server with the following characteristics:
1x (upgradeable to 2) CPU XEON E5310 Quad Core 1.6
8 gb ram etc.
2x 1TB storage

Just completed the installation of zimbra this is the result

top - 14:30:25 up 9:46, 1 user, load average: 0.37 0.16 12:11
Mem: 8054152k total, 3289112k used, 4765040k free, 65848k buffers
Swap: 0k total, 0k used, 0k free, 656268k cached

It 'normal all this RAM usage?

The thing worries me a bit, why should I allow access to this machine about 50 users, all of webmail from PCs and smartphones

I thank in advance those who want to confront their own experiences