E-mail is a traditional method of communication in most companies. It's fast, efficient, transports files and, to some extent, rivals instant messaging applications.
The IT sector is one of the most important parts of the company. It needs to operate with as much constancy as possible, allowing other operations to continue.
When information technology is not part of the company's core business, that is, in situations where it is just a tool, it often happens that this sector is a forgotten sector.