Dynamic Storage Allocation

All customers have a fixed amount of storage space that is allocated to them in the beginning. The storage space can further be allocated by the customer to his mailboxes regardless of the mailbox size he purchased.

Example: If a customer purchases 5 mailboxes, each 1GB in size, he has a total of 5GB allocated storage space. He can then create 1 mailbox that is 4 GB and 4 more that are 250MB each.