Go to the 'Space Admin' in the 'Browse Space' view.
Go to the 'Browse Space' view. There are two ways to browse a space:
Go to a page in the space and select the option you want from the 'Browse' menu. The corresponding tab of the 'Browse Space' view will open.
Or click the icon next to the space name on the Dashboard. The 'Pages' tab of the 'Browse Space' view will open.
Click on 'Mail Import' under the heading 'Mail' in the left panel. This will bring up a new screen.
To import from a Local system, click 'Browse' to select the mbox file. Then click 'Import'.
To import from the Server, enter the location of the mbox file on the server in the 'Server' text field and click 'Import'.
Screenshot : Importing mail
The ability to import mail applies only to global spaces, so the 'Import' section in the above screenshot does not appear in the 'Space Admin' tab for personal spaces. Please see Working with Spaces Overview for information about the differences between global spaces and personal spaces.