Update - This morning we rolled back the Windows 10 Anniversary Upgrade on one workstation and Sales CQ Email works normally on that one workstation.

Can you test CQ on Windows 10 Anniversary Update and if you can replicate the problem, can you let me know if it's possible to get a hotfix?

If the item is already in the queue list, then CQ can email successfully. However, if you select email "now" or "add to queue", and click "OK", the program crashes at that point, so you cannot get any new quotes into the queue list.