Currently using SNL SW2015 to manage 100 licenses. Upgrading client computers to Windows 10 AND upgrading to SNL SW2017.
Do I need to reclaim licenses before the reimage/upgrade?
That something you need to discuss with your VAR anyway before you screwed everything. 100 license is tough one.
Network licences are returned back to the server when they are not in use so you shouldn't need to reclaim any licences unless some have been borrowed and need to be returned. It is worth noting the server that you are using in the SNL manager so that you can easily add it back in once you have reinstalled. It may also be worth contacting your VAR anyway just to make sure the whole process goes smoothly - especially when you have 100 licences to manage. Finally, the process is very different if you also use PDM and so it is critical that you understand the process or ask your VAR about it in order to avoid any data loss.
Retrieving data ...