My iPad with 16 GB cannot BE upgraded. After changing from POP to IMAP the 9.6 GB daten by Mail diminished to 6.6 GB. With all files emptied memory blocked by Mail does not further decrese. Can iExplorer make me clean up memory used by mail? iPad runs 9.3.2, but MacBook Pro stil OS 10.5.8, which seems to have recently stopped the possibility to sync both devices via iTunes. I don't want to upgrade MacBook because that would oblige me to buy some programmes again.