You can target the Mozilla Thunderbird email client by including the CSS class .moz-text-html, which Thunderbird wraps around the contained email.
HTML Email Knowledge Base
Using conditional comments you can target different versions of the email outlook client and include your client specific HTML.
A list of all CSS properties supported in Gmail and Inbox.
Outlook 2007 and 2010 can be a little tricky when it comes to stacking tables side by side or top to bottom, where you may see some undesired gaps between your tables.
Outlook 2007 – 2013 ignores margin and padding CSS styling when placed within an image.