Microsoft recently created a “New” Outlook that is operationally similar to Outlook Online. As of February 2024, several tasks require reverting to Outlook Classic to complete as they are not supported in the newer version. This includes exporting .pst files, importing local calendars, and entering safe mode, among other tasks.
Notably, shared mailbox functionality is depreciated on “New” Outlook, signing into your personal mailbox will populate your shared mailboxes as folders you can read, but you cannot send from the shared mailbox in “New” Outlook.
Switching between New Outlook and Outlook Classic
Option 1: Check for the older version
Depending on the age of your device, both Outlook versions may be installed.
1. Search in the toolbar for Apps: Outlook.
2. If both versions are installed then two application will appear in the search results
3. Click Outlook, rather than Outlook (new) to launch the app and proceed with the instructions for the original task.
Option 2: Use the Toggle
1. In the “New” Outlook click the toggle at the top right of the screen