Hi Jeff,
As I understand it, after the Exchange Online service upgrade, your Android Phone can’t connect to Exchange Online via ActiveSync.
If so, I suggest you update your Mobile Phone Android OS version to the latest version. Meanwhile, currently, there are some known issues on Exchange ActiveSync during the Service Upgrade, please refer to the KB article below for more detailed information:
Current issues with Microsoft Exchange ActiveSync and third-party devices
http://support.microsoft.com/kb/2563324#appliesto
We are sorry for the inconvenience brought by it.
Thanks,
Eric Sun