software recommendation - Is there a free service/website/method of testing an HTML email in a specific client?

I have designed an HTML email template for a client and it works fine everywhere except, according to the client, Outlook 2013.

I don't have access to Outlook 2013 but it would be very helpful if I did. I know there are some services (like MailChimp) that provide the ability to preview your email in multiple email clients for a price but are there any free options?