Adobe Acrobat 7 Professional - Manual (Page 302)

Sorting comments
You can sort comments in the Comments List by author, page, type, date, color, checked
state, or status by person. In a thread of replies, only the first message is sorted, and the
reply messages are sorted in the same category as the first message in the thread.
To sort comments in the Comments List:
1. Click the Comments tab.
2. Choose an option from the Sort menu in the Comments List.