Updating to mBox Mail for iPhone 4.0 may bring up the alert:
“Free trial has ended. Please visit App store to purchase full version.”

Application update was accepted and mBox Mail is back in the App Store.  Please update or re-install.

Update 2: mBox Mail for iPhone was pulled from the app store until this matter is resolved.

A fix was submitted to the Apple for approval the day of the incident. However, due to the holidays we are not expecting the update to be approved until the 29th.

We are very sorry for the inconvenience.

For those that deleted the app and could not restore due to app being pulled off the store:

You should have a backup of mBox Mail as part of your iTunes backups. Please go to iTunes, Devices – pick your device.

Up top select Apps and make sure mBox Mail is checked.

Sync.

If you don’t sync regularly you may even have an older copy of mBox 3 to revert back to. Unfortunately we cannot roll back versions on the app store.