ProQuest® will be performing infrastructure maintenance on June 4, 2011. A twelve (12) hour maintenance window will be required for this maintenance. The window will take place from Saturday, June 4, 2011, at 22:00 EDT to Sunday, June 5, 2011 at 10:00 EDT. See below for a more complete list of times and time zones. The following products will be unavailable during these windows: * Products on the new ProQuest platform will be unavailable. Maintenance window schedule, by time zone: * Pacific Daylight Time: Saturday, June 4, 2011 at 19:00 (7pm) for twelve (12) hours.