Classic Outlook Registry Fix
Following refers to Outlook desktop software running on Windows computers. Not applicable to Mac or phones.
So called New Outlook does not support connections to hosted Exchange. It is necessary to switch Outlook to classic mode.
There may or may not be a button visible in the upper right hand corner of your Outlook which will allow you to easily switch to classic mode.
If you don't see anything like the above, there may or may not be an option on your View menu.
Open Outlook.
Navigate to the Outlook menu.
Uncheck the option for the New Outlook.
Click the Revert button.
Allow the application to revert to the Outlook Classic view.
If you don't see the toggle in the new Outlook for Windows, another option is to apply the registry fix available below or manually edit the registry.
Close Outlook if it's open.
Open the Registry Editor by typing "Registry Editor" in the Start Menu search and selecting the app.
Go to Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences.
Find and double-click on "UseNewOutlook" in the list.
Set the Value Data field to 0.
Launch classic Outlook for Windows from the Windows Start Menu.
If you're not comfortable making changes to Windows Registry you may want to seek help from desktop support.
To use Outlook classic mode, create the following registry entry:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\office\16.0\outlook\preferences
DWORD: UseNewOutlook
Value = 0
To implement the registry change automatically, download, unzip and run the 
UseNewOutlookRegFix.zip.
Close Outlook before implementing the registry change. After implementing the registry change, restart your computer. Remove any erroneous Outlook profiles and create a new Outlook profile. Steps for creating Outlook profiles are
available here.
If you're annoyed this registry tweak is necessary, you're not alone. A person could argue Microsoft's behavior is predatory, anti-competitive and monopolistic. Microsoft effectively cripples small business and advantages Microsoft's Office 365 offering. But of course a person would need to spend millions lobbying Washington DC to make such an argument.
If you have trouble with these instructions, or comments about how to make this page more useful to other clients, please let us know.
