"Show in conversation" should show archived messages in the conversation as well as unarchived. Otherwise, I have to leave all messages lying around in my Inbox until I'm sure the thread is over if I ever want to go back and see what's come before. Also this feature should be available from the message preview. The fact that gmail brings back the whole thread when a new message arrives (even the archived messages) is what makes archiving work. You have to make it attractive to archive stuff or people won't use it. For many people, if they think they'll have to do some complicated search to get back to the whole thread, archiving is heavily disincentivized.
I can't keep my inbox from filling up.
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I want all the messages I send to and receive from one email address in a tab as a conversation. Sorted by date/time.
Conversation breaks as soon as either of us sends an additional email. Occasionally a customer or friend will send from another email address. This should be included if I add this email to their name in the address book, not as critical.
I'd call this "me and you conversation', by email address alone.
Basically I have a bunch of clients and friends with ongoing projects and discussions and I would love to be able to see the entire thing in one tab. It's just too easy to lose track otherwise.
P.S. I have never used Gmail