Hotmail And Outlook.com
Microsoft's move toward online services got a black eye in March of this year when Hotmail and Outlook.com went down for nearly 16 hours. The issue was confirmed late in the afternoon on March 12. What was originally anticipated to be a brief service interruption stretched into the following day. As Microsoft's engineers struggled with the mail issue, it was discovered that SkyDrive was malfunctioning in a way that files were added, edited or removed. However, this glitch was rectified within a few hours. Hotmail and Outlook.com service were not restored until midmorning of March 13. Microsoft later reported that overheated servers in the wake of a firmware update caused the problem.