When working in an office, communication is key - no matter if you are talking to colleagues, your supervisor, job applicants, or customers. It's vital not only for the atmosphere in the office but also for the quick exchange of information to talk to each other. Talking itself can be a real skill, especially when you are giving a presentation, or speaking to potential or current customers. Though communication via e-mail or voice-to-voice chat is frequently used between companies and clients, telephone calls are still the main means of communication. But what's the best office communication tool?