Zimbra will soon be upgrading to a new, more modern interface. You can swap between views by going to the Carat icon or Gear next to the Account Name located at the upper right corner of the screen and selecting the Modern Web Client / Classic Web App option.
Email Basics: Reading & Writing Email
Reading Email
Step 1. From the list of emails, click on the email you would like to read
Step 2. Read the full email in the large box to the right of the email list
Mark a Message or Conversation as Unread
Step 1. To mark the entire conversation as unread, click the Dot (gray is read, orange is unread)
Step 2. To mark an individual message in a conversation as unread, click (more) to expand the conversation and click the Dot next to the message you would like to display as unread.Writing Email
Step 1. In the mail tab, click New Message
Step 2. Add recipient(s) in the To: and CC: lines
Step 3. Add email Subject (if needed)
Step 4. Compose email
Step 5. Click (more) to choose options such as priority and requesting read receipts if desired
Step 6. Click the paperclip to add attachments. Select files from your computer, Briefcase, or an email message. You can also drag & drop a file from your computer to the attachment bar.
Step 7. Click Send at the bottom of the screen – a copy of the sent message is in the Sent Folder