The Distributed Proofreaders site is scheduled to be completely unavailable between 10 am and 10 pm server time on Sunday 5 March 2017 as we upgrade to a new Operating System and move to a different server and hosting service.
The update is not expected to take a full 12 hours. If checks are completed early, the site will return sooner.
Thank you for your patience. As you wait for Distributed Proofreaders to become available again, please feel free to browse through the excellent articles in this Blog.
We’ll keep this blog post updated with progress during the outage. You can also find us in the pgdp Jabber conference room (pgdp@conference.jabber.org)
Update 6:35pm: Site is back up and operational, thank you for your patience!
Update 3:51 pm: Still proceeding as planned.
Update 11:58 am: Proceeding as planned.
Update 10:09 am: Maintenance has started.
Hot off the Press 
Does this mean the storage devices for the database are being physically moved to the new Pittsburgh location?
No.
The new server (prod8) was setup a couple of weeks ago with the new operating system and other software. Then backups of the production data were copied to it over the network while the old server (prod7) was still active in the old hosting location. That data copying process happened periodically as we prepared for the cutover and installed prod8 at the new hosting site. Then today we disabled user access to the site (main, forums, and wiki) on prod7, performed a final data transfer over the network to prod8, and then loaded the data into the databases on prod8. (This is all a simplified, approximate description.)
I’m unable to get into DP at all this morning. I’m still using Windows XP on this computer, so I’m wondering if that has something to do with it. I can’t log in from either FF or IE; it just keeps saying the site is unavailable. Any suggestions?