Outlook 2016 for Mac is designed to make sending and receiving email as simple as possible. It also has features such as Calendar, People, and Tasks, which make communications and scheduling easy. Still, you may have questions on how to perform some functions or may need to troubleshoot an issue. This FAQ attempts to answer those questions and solve your issues.
First, make sure you have installed all Outlook updates, then make sure you have installed any available Apple software updates for your Mac. If updates are needed, install them, even if they don't seem relevant. The problem of not sending emails is most common when using Safari. So an update will often provide a resolution. If the problem persists after updating, refer to the following support articles from Microsoft.
Outlook 2016 for Mac allows you to hide local folders, and this option is turned on by default. If you want to store and access mail, contacts, or calendars on your computer, you can disable this option.
To prevent this, follow the steps from the previous question to open the general preferences, and uncheck Show all mail account folders.
To check the size of your mailbox, you can do the following:
This example shows that your Total Mailbox Size is 6.1MB used of 100GB Maximum.
On a new line, type three underscores [___]then press Enter. Outlook will automatically insert a line separator.