>>>If somebody updates (makes changes, and saves) a message, will I see it again, when I do a global refresh?
>>
>>Only the content is updated.
>
>How about updating the timestamp, so participants in the UT see the message again? If I happened to read the old version of a message, I might be interested in the "new and improved" version as well.

This might create some confusions. I prefer to keep the time stamp as is. Usually, those updates are only used for typos and stuff like that. I don't expect someone to rewrite the entire message for example.