The Micro Eye ZipOut Property Page shown below controls ZipOut's default behavior. Automatic compression will be enabled for each item type that is checked in the Zip Outlook box, and the ZipOut toggle button will appear on that item's Standard toolbar.
Note If you disconnect ZipOut using the Outlook COM Add-Ins dialog box and then later reconnect it, ZipOut will revert to its default settings.

Item Types
Compression Level
Default State (Outlook 2007) or Always reset to ZipOut On (Outlook 2000, XP or 2003)
Always create self-extracting file
Block harmful attachments
Warn when opening items that contain blocked attachments
Check Zip for blocked files
Show ZipOut icon in tray
Check for updates on startup
Send Settings
Manage Settings
Block Attachments