Responsive 3-Columns to 1-Column --> breaking in Outlook

I'm working on a responsive email that has a section of 3 columns that stack into 1 column in mobile. It's working fine everywhere but... you guess it: Outlook 2007/2010/2013. In those versions, the left column is where it's supposed to be, but the center and right columns are not aligned at the top -- they are falling below.

I tried using an MSO conditional to close a TD after the left column and open a new TD before the center column, and again to close a TD after the center column and open a new TD before the right column. However the MSO statements are completely screwing up my layout everywhere (where there were no problems before).

Here's my code:

Any help would be much appreciated!! Thank you in advance!!

See why 200,000 companies worldwide love Campaign Monitor.

From Australia to Zimbabwe, and everywhere in between, companies count on Campaign Monitor for email campaigns that boost the bottom line.

Get started for free