Why does outlook.com automatically resize images to a blurry size?

When I insert large pictures (ex 600x3600 this morning), outlook.com automatically shrinks them down to an almost icon size!! Why does it do that? I just had to go back and send the email with the image through Gmail because outlook automatically resizes images to a ridiculous blurry size. I can manually resize it (by dragging or selecting a preset % from the right click menu), so why do you automatically resize it?? Even when I click on Original Size it doesn't change that. When I sent it through Gmail, I inserted it inline and it looked like it should -> actual size. How can I disable this very very unhelpful auto resizing?