Sean Larkin, who is Technical Programme Manager for Microsoft Web Platform, appears to have been overstating the case a little and had to clarify things in follow-up tweets when his original missive exploded intro controversy.

For a start, there were those in the wider developer world without the ability to read between the lines and accept what ever they are told as literal fact who were rather angry that Microsoft was somehow abandoning C# and C++ for its most mission-critical offerings, freak out no more.

Larkin corrected himself on Reddit, blaming Twitter's character limitations for his many factual errors. "We are not abandoning C++, C#, or any of the other awesome languages, APIs, and toolings that we use across Microsoft," he clarifies. "Nothing [in Office 365] is converting to 'all/completely' JavaScript/TypeScript."

"Office 365’s UI, a lot of it, but definitely not all of it, are pieces that are built using React Native (Windows). API’s and Services are still going to be powered by C++, C#, or whatever is the most appropriate for that team. Nothing is converting to “all/completely” JavaScript/TypeScript."