Last year I upgraded (downgraded) from a Samsung S4 to an S6. The required new Smart Switch syncing app did not perform nearly as well as the former Kies: my Outlook Contact files (Office 2010) became really messed up, and the calendar syncing wasn't as good - but at least I could use the phone with limitations on these features. [My PCs have all been upgraded to Win 10.]
With the recent S6 upgrade to the latest Android, however, I cannot even get Smart Switch (upgraded to its latest version) to recognize my phone over the USB link (which does work for recharging the battery). I see others have the same problem (from a web search).
Does anyone have a suggestion as to how to get Smart Switch to recognize the S6 for syncing? [My Verizon reseller could offer no help.]