For information about planned or un-planned system maintenance and outages (Blackboard Learn as well as other systems), check the NAU IT Systems Status page: http://systemsstatus.nau.edu.
When planned maintenance will result in actual downtime, an announcement will usually be posted on this Bb Learn login page as well (bblearn.nau.edu).
Blackboard also maintains a status page that may be informative regarding specific Blackboard components and services: http://status.blackboard.com.
Be very careful about any emails claiming to be from Blackboard, NAU or other entities that are asking for your personal information (name, username, password, etc.). Never provide your username and password if you aren't absolutely sure you are using a trusted source.
If you do receive phishing emails asking for this type of information, please report them to ITS immediately: http://nau.edu/its/learn/emailphishing