FastMail.FM Vault (business) & FastMail.FM Loop (family) allows an email administrator to group together a number of accounts within a "container". Within the container, the administrator can easily add, delete, and manage the user accounts from a simple administration screen at any time.

Each account in a business or family retains its own standard features, such as the individual access through the web, IMAP, or POP and the ability to send messages via the web or SMTP. Each account has its own mailbox, address book and file storage area.

On top of this, the business/family has the ability to share emails and files on a per-folder basis, and addresses via a global address book.