On the day when Microsoft started giving out invites for the Windows 7 launch party(22nd Sept 2009), Twitter was over capacity.Users at twitter were brought to a screen users see the "fail whale" error message image, an illustration of red birds using nets to hoist a whale from the ocean along with the text "Too many tweets! Please wait a moment and try again.” These 8 birds signifies the 8 servers used for twitter.
Twitter experienced approximately 98 percent uptime in 2007, or about six full days of downtime.Twitter’s downtime was particularly noticeable during events popular with the technology industry .One such event is coming up soon, and thats Windows 7 Launch.Twitter would not want it to be down at that time and Twitter members too.