I honestly credit MSN Messenger with helping me harness my ability to type at speed, back in the days when phone calls were only just being made redundant, and awkwardly chatting to girls was far easier from the other end of a keyboard.
When development started in 1960, many people thought Project Xanadu would change the world. Then one delay led to another and another and another. But after 54 years in development the world's most delayed software went live.
The iOS and OS X ecosystems may not be merging, but they're certainly better friends than before, with Apple's "Continuity" resulting in iDevices being able to finish off where the other left off, plus answer SMS and calls.