经常用OneNote，也是经常遇到这个问题。“we're sorry. OneNote is cleanning up from the last time it was open.”令人恼火。
于是找到解决方案，解决了这次长时间的不能关闭弹框的问题：
How to fix "OneNote is cleaning up from the last time it was open."?

onenotegem 提供了解决工具，如下：