Weight Diet for Outlook is an Outlook add-in designed to help users speed up their Outlook sessions by reducing the mailbox size without having to archive or delete important emails. Weight Diet for Outlook helps users to clean up Outlook and shrink their mailbox size and better organize emails by finding & eliminating obsolete emails, such as duplicate, autoresponder or mail failure messages. Through a friendly wizard-like interface, users can specify which mail folders to scan and how to filter messages so only certain emails will be found.

For those users dealing with a many email attachments, Weight Diet for Outlook can significantly reduce the mailbox size by offering the ability to move email attachments out of the user's mailbox file while keeping a shortcut to the original attachments in the email message. Users can also choose to automatically move file attachments to disk even for future incoming emails. Weight Diet includes the option to move back file attachments to the mailbox file, in case the user wants to migrate the Outlook profile and emails to a different computer.

In order to avoid the frustrations of sending large files by email, Weight Diet for Outlook uses the familiar Microsoft Outlook interface to let users quickly upload file attachments to file sharing servers – such as RapidShare – and automatically replace the attached file with its download link in the outgoing email message. This way, Weight Diet helps users to quickly deliver their messages without worrying that the file attachment may exceed the recipient's email size limit.

After Weight Diet completed its tasks, it offers users the option to compact the Outlook mailbox file so they can take advantage of the reduced mailbox size. Tests carried on regular mailboxes show that the mailbox file size can be decreased with up to 50%, thus significantly increasing the Microsoft Outlook loading and response speed.