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Switching Between Online and Offline Modes 
Prerequisite
Offline support can be activated in your
Logon profile.Procedure
If you are in offline mode, a logon box is displayed. If you are in online mode, a window is displayed in which you can choose which R/3 objects are processed offline and therefore should be copied to your PC (download).

You can enter and send messages as normal in offline mode. The Send function in client simply places messages in the Outbox.
To synchronize changes press the F5 key in MS Outlook or choose Tools ® Sending and Receiving. Thus, the offline changes are "made" (for example, of work items) in the R/3 System and new mails sent from the Outbox in R/3. Furthermore, newly received mails are displayed in client in R/3.
