Many offices have utilized online communication to help them contact clients and disseminate information to other office branches. It's definitely the fastest, more convenient, cheaper, and more reliable means of communication.
Prior to the widespread use of the internet, communication was not nearly as fast and easy. Employees had to travel just to attend a meeting since there was no way to discuss important matters without personally going to the assigned venue.
Thankfully, this isn't the case in the modern office anymore. It's safe to say that people have it easy nowadays with the latest technological advancements that can be utilized in the workplace. Many offices now have their own computers with internet access which allow them to communicate with fellow employees and department heads without the hassle of personally going to them.
However, online communication must be used properly and cautiously. There are many hackers and scammers who will try to get into your online account. Change your password regularly and don't share it with others. Be extra careful when opening or reading mail from people you don't know.