Mulberry is a powerful, easy to use electronic mail (email) and calendar program that allows you to send, access, and manage email and calendar data. Mulberry also helps you manage other email and calendar related information, such as address books.

To ensure maximum compatibility with existing email servers, Mulberry uses Internet-standard protocols: IMAP and POP3 for reading email messages, SMTP for sending email messages, MIME for sending and receiving attachments within messages, IMSP and ACAP for storage of preferences and address books on a remote server, and LDAP for address lookups. It also uses http, WebDAV and CalDAV for storing and retrieving calendar data.

Mulberry has been designed to fully exploit the graphical user interface provided by the Mac OS. For example, Mulberry supports drag and drop so that selected items, such as messages, addresses, or any text, can be dragged onto other items to facilitate copying of items from one location to another.