An addendum to my comment above: Three days later I have now also been bitten by Google's April Fool's feature/bug! Today I received an email from someone aski

An addendum to my comment above: Three days later I have now also been bitten by Google's April Fool's feature/bug! Today I received an email from someone asking why I was not replying to the other email thread started on April 1st. The person had clicked the 'drop the mic' button, and was not seeing any further replies to that thread. Not good!