For those of you who have upgraded to Microsoft Office 2016 and are using Microsoft Skype for Business 2016 with Microsoft Office 365, you may have noticed a seemingly endless authentication loop where after having successfully signed in with your Office 365 credentials, you keep getting prompted to indicate if this is a work or Microsoft Account.

This basically  makes Skype for Business 2016 (Lync’s new name) unusable so we opened a case with Microsoft to try to get a fix.

The result of the case was as follows:

1. Exit out of Skype for Business, and delete following files:


2. Make sure you empty Lync folders under:        



3. Create these two DWORD32 entries







4. You may have to reboot the computer.

Start Skype. You will be prompted once to enter User/Pass to access corporate address book.



The other issue that we’ve noticed with Skype for Business 2016 is that after a few minutes of use the backspace key stops working in message replies and you’re stuck having to highlight words that you want to delete and use the DEL key instead.  We haven’t got a fix for that one yet, so my personal recommendation is to just avoid Skype for Business 2016 completely and revert to Skype for Business 2015 which is part of the Microsoft Office 2013 media.

To do this, in Programs and Features, select Microsoft Office 2016 and choose change.

Remove the checkbox beside Skype for Business 2016.

When that’s done, go back into Programs and Features and this time select Microsoft Office 2013 (assuming that it is still listed) and choose Change.

Check the checkbox beside Skype for Business 2015.


When done, you’re back up and running on the stable release of Lync (Skype for Business 2015) and aren’t stuck in endless authentication loops and you can actually use the backspace key.

I’ll update the article later when we get a solution to the backspace key.  For the moment we’re going to block the upgrade of Skype for Business from our volume media setup files.