Saturday, June 2, 2007:

On June 2, 2007 from 06:00 AM EST to 06:00 PM EST - CDX Web may be unavailable to all users, including the Exchange Network due to hardware and operating system maintenance upgrades.

Saturday, May 26, 2007:

May 26, 2007 04:00 AM EST to May 27, 2007, 08:00 AM EST - CDX Web may be unavailable to all users, including the Exchange Network due to preventive maintenance of the NCC electrical systems.

Saturday, May 19, 2007:

May 19, 2007 06:00 AM EST to Midnight EST - CDX Web may be unavailable to all users due to hardware and operating system maintenance upgrades.

Saturday, May 12, 2007:

May 12, 2007 06:00 AM EST to 05:00 PM EST - CDX Web may be unavailable to all users due to hardware and operating system maintenance upgrades.

Saturday, April 21, 2007:

April 21, 2007 05:00 AM EST to 4:00 PM EST - CDX Web may be unavailable to all users due to hardware and operating system maintenance upgrades.

Friday, March 16, 2007:

March 16, 2007 09:00 PM EST to March 17, 2007, Midnight EST - CDX Web may be unavailable to all users, including the Exchange Network due to hardware and operating system maintenance upgrades.

Friday, March 9, 2007:

March 9, 2007 06:00 PM EST to March 11, 2007, Midnight EST - CDX Web may be unavailable to all users, including the Exchange Network due to hardware and operating system maintenance upgrades.

Saturday, March 3, 2007:

March 3, 2007 06:00 AM EST to March 3, 2007, 05:00 PM EST - CDX will be unavailable to all users, including the Exchange Network due to hardware and operating system maintenance upgrades.

Friday, February 23, 2007:

February 23, 2007 09:00 PM EST to February 24, 2007, 12:00 PM EST - CDX will be unavailable to all users, including the Exchange Network due to hardware and operating system maintenance upgrades.

Friday, January 26, 2007:

January 26, 2007 06:00 PM to January 29, 2007, 08:00 AM EST - CDX will be unavailable to all users, including the Exchange Network due to support for system-wide stress testing.

Saturday, December 30, 2006:

December 30, 2006 06:00 AM to 10:00 PM - Power outage at the EPA National Computer Center (NCC) in Research Triangle Park: CDX will be unavailable to all users, including the Exchange Network.

Friday, December 15, 2006:

December 15, 2006 09:00 PM to December 16, 2006 2:00PM - Database Maintenance: CDX will be unavailable to all users, including the Exchange Network.