In the File menu select Work Offline (Sun Java System Connector).
The Work Offline dialog appears.
Click Yes to download messages before going to offline mode. You can set the size limit of the downloaded. See Configuring Mail Properties for instructions on setting these properties.
Only the messages in folders selected for offline use will be downloaded. See Selecting a Folder for Offline Use for instructions.
Click No if you do not wish to download any messages.
A check appears next to this menu item.
Once you are in offline mode, Connector for Microsoft Outlook disconnects from the server, and all subsequent operations (for example composing, deleting, and moving messages) will occur on your local machine until you switch back to online mode.