Hi all,
Some of Acrobat's commenting tools have become free in Reader over recent updates. Here's where things stand for reviews and page rotation.
How do I review and comment on a PDF in Acrobat?
Most core commenting tools, including sticky notes, highlighting, underline, strikethrough, and freehand drawing, are available for free in Acrobat Reader, not just paid Acrobat. Stamps such as Approved, Draft, and Confidential are available in Acrobat.
Reader users can join and comment on a review someone else started. If you need to initiate one, use Acrobat Standard or Pro. If you're not sure which you have, check Help > About in Acrobat.
References
How do I permanently rotate PDF pages?
Rotating the view in Reader doesn't change the document. Permanently rotating and saving pages uses Acrobat's Organize Pages tool, available in Acrobat Standard or Pro.
Acrobat Reader lets you rotate the view of a PDF while reading it, but that's a display setting only. To save a rotation to the file itself, use Organize Pages in Acrobat, which updates the page orientation and saves the change to the PDF.
Reference
Thanks,
^BS