There is an envelope icon to the left of personal message titles with the tooltip:
"This topic is a personal message"
That’s somewhat informative, but it totally hides the more important fact that clicking on the envelope takes you to your Inbox
You can change that message at: Customize / Text / js.topic_statuses.personal_message.title
But it might be preferable if the default were already “Go to Inbox” or something similar
I wonder if it’s worth having the link there at all? It’s a bit of an oddball ninja navigation feature.
I use it all the time though! why-not-both-girl.gif
This topic is a personal message (select to go to your inbox)
I click the envelope frequently too. If we remove the link from it, we need to add some other way to “go to inbox”. A 
button perhaps?
I definitely would like a button, and it would help if it were more obvious what it does.
Sure, maybe it should be styled as a button? I’m not sure. What do you think @awesomerobot ?
I also use this all the time to find my way back to the inbox. I like the idea of making this link back more obvious.