There are many limitations to using Outlook or other email clients for e-marketing. It is difficult to create a professional looking email that helps your subscribers take action, and you may breach the Spam Act legislation if you don't manage subscriptions properly. Sending to more than a couple of hundred contacts at once is near impossible, and what happens to your campaign after you press 'send'?
It's an Australian product tailored to the Australian market
Know who has opened, forwarded and clicked on which hyperlinks
No ugly branding in your emails...