I need some advices from you people.

I am about to implement a groupware software in a public hospital (a big one)

I dont know wich groupware collab. software to use, I am beetwen Zimbra and OpenXchange.

I would like to know some experiences, some comparatives, wich features has zimbra that does not have openxchange.

advantages and disad.

thanks a lot.

any link, any comment, anything will be welcome