Today, I found that I can no longer send emails from Outlook.com on any device that uses Exchange ActiveSync.

I have an iPhone 4S running iOS 6.1.3, an iPad 4 running iOS 6.1.3.

Both devices are able to receive messages, but neither are able to send.

I have tried to change internet connections (cellular and wifi) to ensure that it's not network related.

I also tried to remove and then re-add my account to both the iPhone and iPad with no success.

I also have a Windows 8 machine with Outlook 2013 installed, and as of today, I can not send email from there either. I have tried on 2 different computers, and have tried to delete and then re-add the account on both machines. None of this has helped.

I am able to login at mail.live.com and send/receive email there without issue, and I am not prompted to verify my account.

Any ideas for what could have gone wrong?

Thanks in advance for any help.