Few days ago, i am perform upgrading Zimbra NE from 8.6 into 8.8.3 on my client. When upgrading into Zimbra 8.8, i am getting problem with proxy and has been solved with adding vhost. The solution has been wrote on previous post : https://imanudin.net/2017/09/18/solved-cannot-access-webmail-zimbra-8-8-from-ip-address/ Another problem is my client use chat as another method to connect ..
After install/deploy ZeXtras chat, you can backup the history of chat (include buddy list) on ZxChat and restore them if someday you need to restore. This method also used after migrating Zimbra to Zimbra that usually i am doing in my client who use ZxChat (in old server). Please backup zxchat folder that located in /opt/zimbra/conf/zextras. If you want to restore ..