We only have 20mb. My inbox is constantly getting full. The worst thing is that we use OWA and activesync is disabled, so you cannot save them locally at home on a pst file or through mac mail/thunderbird/etc. Luckilly, I have the unadvertised, super secret, exchange server address to use outlook at work so I can save a local PST file of all sent and received emails. As a teacher, you need to save EVERYTHING! 20mb, plus crippling the ability to attach the exchange server to a client software program is absolutely insane. However, my pst backup file is saved on the computer at work, on a thumb drive, and on my mac at home (which in turn backs up to a usb time machine partition, which in turn backs up to a raid 1 NAS. Overkill at its finest!)