This is only applicable if your server administrator has not disabled EAS for Outlook. If it is disabled, please follow the guide for Outlook 2007 instead.
Outlook 2016 has an issue with autodiscover. Only Outlook from Office 365 is affected. If you installed Outlook from another source, please follow the guide for Outlook 2013 or higher.
For EAS you must use the old assistant by launching C:\Program Files (x86)\Microsoft Office\root\Office16\OLCFG.EXE. If this application opens, you can go to step 4 of the guide for Outlook 2013 below.
If it does not open, you can completely disable the new account creation wizard and follow the guide for Outlook 2013 below.
If this is the first time you launched Outlook, it asks you to set up your account. Proceed to step 4.
Go to the File menu and click Add Account.
When prompted, enter your password again, check Remember my credentials and click OK.
Download and install Outlook CalDav Synchronizer.
If this is the first time you launched Outlook, it asks you to set up your account. Proceed to step 5.
Go to the CalDav Synchronizer ribbon and click Synchronization Profiles.
Click the second button at top (Add multiple profiles), select Sogo, click Ok.
Click the Get IMAP/POP3 account settings button.
Click Discover resources and assign to Outlook folders.
In the Select Resource window that pops up, select your main calendar (usually Personal Calendar), click the ... button, assign it to Calendar, and click OK. Go to the Address Books and Tasks tabs and repeat repeat the process accordingly. Do not assign multiple calendars, address books or task lists!
Close all windows with the OK buttons.
The Mac version of Outlook does not synchronize calendars and contacts and therefore is not supported.