Mark Message As Read Or Unread. Mark as unread or read. Click Mark as Read or Mark as Unread.
Keep Outlook Emails as Unread until after you actually read themClick on File OptionsClick on Mail from the left side columnClick on the Reading Pane button on the rightOn the Reading Pane dailog box tick the checkbox for Mark items as read when viewed in the Reading PaneEnter a time in the box beside Wait XX seconds before. When you disable this option all mails remain as unread unless you manually mark it as read or double click the message to open it in its own window. On your messenger what you need to do is Tap and Hold on a chat and select the option Mark as unread.
On your computer go to Gmail.
On your computer go to Gmail. Click Mark as Read or Mark as Unread. Mark all messages as read. Select the messages you want to change.