Question: what happens if u register same username in yahoo from 2 diff countries at the same time? How does yahoo databases in different parts synchronises them at same time. It takes atleast a sec to synchronise between all databases, right? does that mean u can register same username from 2 diff countries if u do that simultaneously

Answer: They could have run into this problem in the olden days, then they were just giving my-id@yahoo.com type of ids. Now based on the country we select, they have started giving country specific mail ids. So for some one in India, it would be my-id@yahoo.co.in and my-id@yahoo.co.de for Germany and so on. This would reduce the duplicate ids problem.
This question from the Yahoo Q&A forum is categorized in the topic: Science & Mathematics