Good Ebook on in place upgrade for a single Lync Server 2013 to Skype for business server 2015 upgrade. This covers a single standard edition Lync 2013 front end so upgrade times will vary and dependent on server count and different roles aren’t included in this ebook yet.  Gives good detail into what’s coming and the process for in place and prerequisites required. Defo time to get prerequisites done !!!

Be good to see move user in place upgrade for multiple pool / SE upgrades included. Looking forward to 1st May exciting times and upgrades ahead 🙂

https://gallery.technet.microsoft.com/office/Upgrading-to-Skype-for-61c344cd