Exporting/archiving UTmail+ account content locally (in addition to keeping it on the server) allows messages, contacts, and calendar items to be accessed when the computer is not connected to the Internet. Please note that when new messages, contacts or calendar items are added to the active account, the archive does not automatically update.
You can also export/archive content to local storage and delete that content from the server to reduce the total storage used that counts towards your storage quota. You maintain a record of any saved content in the archive.
Finally, you can import the archived content into Outlook and move it to a new account if necessary.
The export function is only available in the legacy version of Outlook. To see if you are running that, click on the Outlook menu and see if there is a checkmark beside Legacy Outlook.
There are two methods to save messages. Using the Export function, and dragging individual folders to a location on your computer.
Export Function
These instructions allow you to manually export/archive email messages, contacts, and calendar data to an Outlook for Mac Data File (.olm). OLM files can only be imported back into legacy Outlook for Mac.
To Import an OLM file: https://support.microsoft.com/en-us/office/import-email-messages-contacts-and-other-items-into-outlook-for-mac-6cc48404-a65c-4b8c-a12a-95a905249414
Drag and drop individual mail folders to computer
This will give you a .mbox file which could then be imported back into legacy Outlook for Mac or Thunderbird, or moved to Local Folders in Outlook.
Click on a folder and drag it to a location on your computer such as the desktop. This will create a .mbox file. These files can be imported into Apple Mail or Thunderbird, or can be added to Local Folders in Outlook.