When I design emails in some of the templates, they show up excellent on my MAC. When I send a test, to some other of my team members, it seems that outlook PC is not as forgiving, do you suggest building the emails out on a MAC or PC? How do you possibly view all of the different platforms?
As a general rule, Liz, Outlook is a notoriously fickle platform for email rendering. Depending on the version of Outlook being used, you will see wildly different results in the inbox. As Murtza recommends, try Litmus. It's a great tool that everyone should be using.
One thing I've done recently is start with some of the templates available on templates.marketo.com and customized for our needs. This removed a lot of the back and forth of getting things to look appropriate. I wish there were more choices (for event invites, etc.), but it was good to get a set of nurture templates into our library.