Mozilla Thunderbird keeps freezing, not responding, crashing, hanging - These are some various problems that can occur with Thunderbird, but you should Solution 2 - Update Thunderbird.Below, we will try to give you several useful methods which should help you deal with the most common causes of these random Windows 10 freezes. However, there are a number of other possible reasons behind this issue. One of the most common causes for random Windows 10 freezes is a driver incompatibility.Ok, sometimes I can't find my new mail, but clicking View: Unread always shows it (same thing that sibling post mentioned). Strange, I've been using thunderbird since it was at version.3, on several different computers, using both Linux and Windows, and I've never seen those problems.I have tried every conceivable method that has been posted on this forum. When I try to open either Mail or Calendar they crash immediately. I have Windows (OS Build 14393.187) After uninstalling Microsoft Office 2016 I am unable to use the Windows 10 Mail and Calendar app.