The 15.6 Release provides several new features to drive increased engagement on your communities. First, we’ve added the ability to view attached PDF documents inline, without having to download them...
Updated 6 months ago
Version 15.0
Blog Post
Please add your vote and comments to http://community.lithium.com/t5/Product-Ideas/Threaded-Private-Messages/idi-p/7239
It's been a popular request for a long time and JeffSp says its on the backlog.
Jason