A few quick steps to configuring the show/hide formatting marks button.
Solutions for troubleshooting the issue that every received email in Outlook is received twice.
Repairing / Restoring Emails And Identities In Office 2016 For MAC Systems
Repairing / Restoring Emails And Identities In Office 2011 For MAC Systems
How to permanently remove Outlook emails that appear crossed out when supposedly deleting them. Follow these steps if you can't remove emails or can't find the removed items folder.
How to export emails from Windows Live Mail to Microsoft Outlook via the third party program called MailStore.