Migrating Samsung S4 phones from Exchange 2003 to Exchange 2010---

Hello all.  Thanks for taking the time to look at this question.

I have multiple Samsung S4 user mailboxes that exist on Exchange 2003.  I want to migrate them to Exchange 2010 without touching the  phones.

Here is a working process for Iphones:

1.  Perform a new local move request to move the mailbox from E2K3 to E2K10.--No issues

2.  Point Public DNS from Old.com to New.com---This points the old DNS record of the old server to the new server.--This works.

At this point, the Iphone can send/receive email without issue.

When I perform the above steps on multiple Samsung S4s, I get login failed to the server popping up on the phone.  If I delete the exchange account from the Samsung S4, and add it again, it works.

Any thoughts so that I can seamlessly migrate my users?

Thanks