To migrate emails from Institute mailbox @ift.uni.wroc.pl to University email @uwr.edu.pl:
* create new folder where you want to put your old emails
* On the top panel click File * Choose Export to file option * Use pst filetype * Choose folder to export
* On the side panel choose the folder, which we create at the beginning
* On the top panel click File and on the left choose Open and export * Import from file * Choose pst file and setup path to exported file in previous steps
* Check option Import to current folder. All subfolders from @ift account will be recreated within that folder.