Undo mistakes
If necessary, you can cancel a lengthy operation before it’s completed, undo recent changes, or revert to a previously saved version. You can undo or redo up to several hundred of the most recent actions (the amount is limited by the amount of RAM available and the kinds of actions you performed). The series of actions is discarded when you choose the Save As command, close a document, or when you exit from the program.
If you have access to a
Version Cue Workspace, you can create and locate different file
versions using Version Cue features in InDesign or InCopy. The Version Cue
Workspace is available only as part of Adobe Creative Suite® 3. 
Do one of the following:-
To undo the most recent change, choose Edit > Undo [action]. (You cannot undo certain actions, such as scrolling.)
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To redo an action, choose Edit > Redo [action].
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To undo all changes made since the last time you saved the project, choose File > Revert.
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To close a dialog box without applying changes, click Cancel.
Comments
Comments are no longer accepted for InDesign CS3. InDesign CS4 is the current version. To discuss InDesign CS3, please use the Adobe forum.