Had a few questions about private messages, so thought I would summarize how the new system works.
In the old system, all private messages were individual messages. So you had conversations by means of back and forth messages unrelated to each other. Sent messages (unless you kept them neat and deleted regularly) were also individual messages.
In the new system (which is FAR superior) your messages form a conversation. Much like Gmail etc uses nowdays. Easier to keep track of a topic or conversation you are having with someone. You can also bring up to 5 people into the same conversation via pm if needed.
Once you open up a conversation or message, you will see the option at the bottom to archive it. This means it is emailed to you for backup, so you can delete it if necessary.
You are currently allowed 150 messages. Like the old system, you can create folders and move conversations into them.
When the old system converted the database over, all the old pm's (being individual and not a conversation) now become single messages/conversations.
Because there is no "sent" folder here, your old sent messages are also present in your messages application. You can see yourself as the sender.
Might benefit people to take some time and delete messages they don't need and archive old ones.
Yes...you can see if yours conversation message was read yet or not....just take a look at your messages folder.
The messages you sorted into folders on the old forum will now be all in your messages folder. A bit of work, but since you can archive them now, you can probably clean up a lot of them. You can mass-mark messages on the main page and then move them into a folder you created. But bear in mind 150 message limit comes along fast, so do some cleaning out.
Hope this clarifies a few things. Message icon is the envelope top left of the default style, and top right of the IP one.
Note that in profile you can set the preferences on whether new messages open automatically (preview) as you load the forum or whether they just show a numeral over the envelope to show how many messages are waiting.