We have a really strange problem with a newly installed server (SBS 2011) and OWA access via droid smartphones.
Here's the deal. I know this isn't a firewall issue, etc., because I can use OWA from anywhere using a web browser and log in as any user and it works fine.
When I try and setup the user accounts from a droid smartphone (I've tried SEVERAL different brands/models), I can't get the user accounts to setup. Sometimes they'll setup, but not sync, other times they won't setup at all. However, I can setup the admin account on those droid devices and they work just fine.
So, why will the admin account work fine, but the user accounts won't?