From Gmail to Outlook: how it works and what to look out for

Many entrepreneurs who started small and see their business grow over time sooner or later run into typical growth problems. Do your accounting manually, for example, or increasingly have to draw up invoices. Setting up your business e-mail is another problem. Gmail and Outlook are the two tools that entrepreneurs are using to tackle that problem. Which one should you choose? What are the pros and cons? And how easily can you switch from one to the other?