Hmm...that's interesting, it should be there right between the Debug and Tools menu. Here is one thing to try:
-Go to the Tools menu, select Import and Export Settings...
-On the dialog, select the 'Reset all settings' radio button. Click Next
-If you want to save your existing settings, select a file and path, if not, click the 'No' radio button and Click Next
-On the next page, select 'General Development Settings'.
-Click Finish
This should enable the 'Data' menu option to appear in the main menu.
Hope this helps,
-Tom