Attention!
The size limit for the imported file/archive is 64 MB, which, in case of the archive, is approximately 3.5 million messages.
To export messages to a file, open the Export and Import Messages tab in the left section of the window. Select the destination format and click Export.
Depending on your browser configuration settings, you will be offered
to open or save the file. The file with exported messages can be
compressed. For this, leave the checkbox Compress file marked.
The supported export formats are:
Saved files on the disk containing messages from the unit can be
imported into the units you create. To import messages, select the Export and Import Messages tab in the left section of the window.
The supported import formats are:
Click on the empty field, specify the file to import the messages from, and click Upload.