F39C6D8A52E04898;branched=FALSE;ms-received-port=53811;ms-received-cid=718100, SIP/2.0/TLS 192.168.170.1017;ms-received-port=50017;ms-received-cid=208A00 means that there are federation issues.
Since I know I enabled PIC Federation through Office 365 and federation worked to other partners (hotmail users for example), I assumed this was an issue with the PIC configuration.
Just apply the latest Office Professional Plus 2013 updates, and you will get the Skype for Business client update.
Most of you are aware that the UI can either run as the Lync 2013 look-and-feel, or the new Skype for Business look-and-fell (if you are not familiar with it, do a quick search, or visit one of the many good write-up’s like fellow Lync MVP Tom Arbuthnot’s write-up here: Important Changes coming to the Lync 2013 Client UI/UX in the April 2015 Client Patch).
F8660_fbz_button[type="button"]:active, .ezoic-wrapper .
F8660_fbz_button[disabled=disabled], .ezoic-wrapper . F8660_fbz_button[type="button"]:disabled, .ezoic-wrapper . F8660_fbz_button[type="button"]:disabled:focus, .ezoic-wrapper . F8660_fbz_button[disabled]:disabled, .ezoic-wrapper .
F8660_fbz_row td, .ezoic-wrapper tr:nth-of-type(even), .ezoic-wrapper tr:nth-of-type(odd) .ezoic-wrapper .
F8660_fbz_button[type="button"]:hover, .ezoic-wrapper .