MailZip Pro is the most powerful and multifunctional Microsoft Outlook add-in for managing of attached files.
Main features of MailZip Pro:
MailZip Pro automatically archives attachments in outgoing messages, unpacks archives in incoming messages and works with password-protected archives. MailZip Pro opens or saves attached files in a selected folder on a local or network drive MailZip Pro allows opening or saving hidden attachments like background pictures.

Automatic packing of big-sized files in outgoing messages can save you time and money thanks to traffic economy. In some cases, for example, when sending text documents, packing into a ZIP-archive can reduce the size of them in many times. That allows to reduce the time of sending a message and traffic consumption.
By default, Microsoft Outlook blocks those file types that can be potentially dangerous and can cause a lot of problems if you want to send such a file to the recipient. But if this file is ZIP-archived, the recipient will surely have access to it. At the same time, the use of password-protected archives allows you to be sure that packed files are going to be viewed only by the person whom they are destined to.