The answer by "Gilad D" is correct, however some clarification is in order:
There are four main areas in Acrobat that can be accessed. One way to access these areas is via the "view" menu by clicking "tools" or "show/hide".
1. Menu Bar — The old menu items "Documents, Comments, Forms, Tools and Advanced" are gone and all that now remains is "File, Edit, View, Window, Help".
2. The Tools Pane — The functions that were previously found under the menu bar items "Documents, Comments, Forms, Tools and Advanced" — these can now be found in the Tools Pane. The Tools Pane pops up on the right hand side of your window/screen.
The drop down groupings in this pane can be customised via View menu > "tools", or "tool sets".
3. Finally there is the "quick tools toolbar", which is made up of the little icons with no text captions, that typically sit at the top of the active window. Most functions can be accessed by these icons (customisation required).
4. For completeness, there is also the pane area in Acrobat called the "navigation panes" which sit on the left hand side, featuring "page thumbnails", "bookmarks", "attachments" etc.