No-longer-valid comments that were responded to
45799
Right way to handle obsolete comments when some of them are mine?
158881
Edited answer converted to a comment produces "no edit history found for this comment" message
14309
Collapse comments on old questions
78830
Deleted comments are persisting in the global inbox
37700
How can I ask for clarification on a question I'd like to answer if I can't add comments?
12347
How should I handle questions which are answered in the comments?
7768
What should be done with questions that have been resolved as a comment instead of an answer?
30659
I am notified about old comments instead of new ones
109895
Line/word wrapping in revision history and responses tab (and probably other places)
24768
Updated comment flagging - Supporting the new Code of Conduct
36706
Let us view our deleted comments
43030
Can non-10k users see comments left on their deleted content?
141041
Migrating a question deleted a comment
87725
Question history attributed changes to me that I didn't make
117800
Comments not showing time of posting under some circumstances
25324
Flagging a deleted answer results in a message saying I am flagging too quickly
9977
Policy on accepting answer after question is no longer relevant to original poster