If you are using an email account with the Outlook app installed on your iPhone, you may receive a message to login again.
We are having trouble accessing you account. Please log in again.
Either your email provider is having technical issues or your password was recently changed on your account. Click login to attempt to login to your account. If you still cannot login, your provider is most likely having issues. Check to see if they have an official Twitter account and if they are reporting down status.
Another good site for service related issues is Down Detector.
*If you are experiencing an outage with your email in the Outlook app and receive this message, share in the comments below to let others know.*