Update 5/19 @ 2pm:
Freading has had to postpone this maintenance from May 20 to June 10.
Freading ebooks will be doing server maintenance the morning of Saturday, 6/10/17. The site will be unavailable from about 2am to 8am Central time.
Any Freading ebooks downloaded before the maintenance begins will not be affected. You will simply be unable to checkout more books during the maintenance window.