Hi guys... I get stuck!!!! I've just completed the straight upgrade as the title of my post of a zimbra multiserver installation from 6.0.8 to 7.1.3.
Now, when I try to startup the proxy server I get an error about imapProxyserver
"Starting nginx...nginx: [emerg] open() "/opt/zimbra/conf/conf/nginx/includes/nginx.conf.main" failed (2: No such file or directory) in /opt/zimbra/conf/nginx.conf:5"

In this post it's suggested to upgrade one step at time from 7.1.1 to 7.1.2 (link) but I've already the 7.1.3 installed!

HEEEEELPPPPP! my grace time is almost over!
MANY THANKS TO EVERYBODY IN ADVANCE