Zimbra was already running in this company as the mail server and I have to upgrade it from 4.5.9 NE to the latest NE on redhat linux to get some required features... namely the free/busy feature.
Can someone write down the steps on how to do it? I.e. from where to download the latest upgrade all the way to the commands to write on Linux to do the upgrade? My redhat linux admin skills are at a junior level and since I didn't install Zimbra, I'm not sure how it is installed or upgraded.
Would really appreciate a positive response! Thanks guys!