If you are sending the email from Outlook directly, it can be hard to get the timer to work, as Outlook prefers to make a copy of the image and include it as an attachment. This is one reason we recommend using an email campaign tool like MailChimp or Constant Contact. We do not recommend using Outlook to send out emails with the MotionMail timer.
If you would like to try using MotionMailApp timers with Outlook, here are some instructions, which should allow Outlook to send a link to the timer. Just use the link in the <img src="YOUR TIMER HERE"> part of the timer that you copy and paste when doing this, not the whole HTML snippet: http://superuser.com/questions/363697/how-can-i-insert-a-remote-image-into-an-email-without-attaching-it-using-outlo