I love how simple it is to send mail from my computer using this service. It's very easy to set up your account for sending emails, no hassle with any of that stuff! Nothing really - just make sure you have enough space in your email address because if one goes out of bounds then everything gets deleted (which can be annoying). The only thing i don't like about courier is they charge per GB transferred. Be aware of this before signing-up otherwise you could end up paying more than what you should. Sending messages to people who are not available during office hours was always difficult as our team used to write down their contact details manually. This has become easier now thanks to couriers.