We figured this out, turns out it's pretty easy. Here's how, if anyone is interested:
ASDM 6.1
Config->Remote Access VPN->Clientless SSL VPN Access->Connection Profiles->Add
Give it a name like OWA_CP.
At the bottom of the screen, for Default Group Policy, click on the Mange button to add a new Group Policy.
In Configure Group Policies, Add
Give it a name like OWA_GP
Everything is default until, MORE OPTIONS->Customization.
Change the Homepage URL to your OWA URL or whatever portal page you want to pop up, something inside your network.
All else for Group Policy is default. Ok and save.
Back in the Connection Profile Configuration, click Advanced->Clientless SSL VPN
At the bottom, in Group URL's, click Add and add the URL(s) which will you will give your users to connect to the portal from outside. For instance:
https://ourvpn.ourcompany.com/portal
Note, if you have http redirect, don't forget to add a URL just for the http:// also.
That's it.