Thank you for your votes and comments on this feature. The team is in the process of finalizing designs for deleting private chat threads. I will update as we have more progress to share.
We’ve put this into our road map! Stay tuned.
And if you want to participate in user testing for this feature, you can sign up here: https://1drv.ms/xs/s!AryUNzh1ogZzif8pDcOcx2pW45I87w
If you have any questions or more to share about Skype, just submit feedback here or tweet to me at @skprufo.