You can open Adobe® Acrobat® PDF files you have stored in a 2010 Documents tool for reading or editing. If you edit a PDF file, you can save your changes to the workspace in either of the following ways:
On the File tab, click Save.
If you close an edited PDF file without first saving it, Acrobat prompts you to save the PDF as a new file. To avoid creating a new file instead of simply saving the existing file, click Cancel to close the Save As dialog box, and then save the file using one of the alternatives described above.
If you have already saved the PDF as a new file, you can delete or rename the original version of the PDF in the workspace, and then add the new version to the workspace.