Using Ghost Columns to Fix Alignment Problems in Outlook https://www.emailonacid.com/blog/article/email-development/using-ghost-columns-to-fix-alignment-problems-in-outlook/
Coding for the Beast that is Outlook 2016 https://www.emailonacid.com/blog/article/email-development/coding-for-outlook-2016
Gallery of Common Outlook Rendering Issues http://freshinbox.com/blog/gallery-of-outlook-rendering-issues/
Will There Ever be an Email Standard? http://www.emaildesignreview.com/html-email-coding/will-there-ever-be-an-email-standard-2707/
A PDF guide to coding for Outlook http://www.emailonacid.com/images/blog_images/downloads/2014/wp_outlook.pdf
A Guide to Bulletproof Buttons in Email Design https://litmus.com/blog/a-guide-to-bulletproof-buttons-in-email-design
Removing spacing from around tables in Outlook 2007 and 2010 https://www.campaignmonitor.com/blog/post/3694/removing-spacing-from-around-tables-in-outlook-2007-and-2010/