You wish to increase your storage space for your files and e-mails? This is done very easily.
Log in to your mailbox.org Office and go to the Settings page (the striped icon at the top right):
Select the first item, ‘mailbox.org,’ to open the mailbox.org user data section.
Under ‘Contract and Fees’, you can quickly and easily select another package. You can switch to a different package at any time. When you switch to a less expensive package, the fee difference will be credited to your balance.
After you have selected a new package, the old package is billed instantly and the remainder of the fee is credited to your balance. For example, if you paid €1 and used the MAIL package for just two weeks, you will be charged €0.50 and receive the remainder as credit.
To see how much storage space is left, have a look at the widget "Quota".