Where to find the latest Zimbra (upgrade) documentation?

The latest documentation for Zimbra Network Edition can be found on our documentation Github page, here are some direct links:

• Upgrade Instructions (EN)
• System Requirements (EN)
• Single-Server Installation Guide (EN)
• Multi-Server Installation Guide (EN)
• Guide to Rolling Upgrade (EN)
• Administrator’s Guide (EN)
• Configuration Guide (EN)
• Multi-Server NG Modules Migration Guide (EN)
• User’s Guide for Modern Web App (EN)
• User’s Guide for Classic Web App (EN)
• NG Multi-Node Guide (In-Place Upgrade) (EN)
• NG Multi-Node Guide (Rolling Upgrade) (EN)
• NG Single-Node Guide (In-Place Upgrade) (EN)
• NG Single-Node Guide (Rolling Upgrade) (EN)