Create username / ID with a dot in Yahoo

Email ID / Username of Yahoo, the web giant can have alphanumerics, with underscore ( _ ) the only used special charachter. But, now they have included dot (.) as a part of their username / id special character list. The best of all is if you have a yahoo Id before you can then integrate it with the new one, means you can have two username pointing to the same mailbox. Cool
Click here to integrate your existing account with another one.
If you have a yahoo mail Id like : kiruthik_kumar then you can also create kiruthik.kumar pointing to kiruthik_kumar. Even you can change the primary account to the new one. Also you can login with that!!!
Gmail gives an option to send mails from any email Id provided that is a valid one. (Its very much different from Yahoo's work)

The main difference between the Gmail and Yahoo in this regard is :
Yahoo Supports only one mail Id (that must be also a yahoo Id) both sharing the common mailbox.
Gmail supports any number of email Id(regardless of domain), but its for outgoing mails only. (Even not possible to get mails from your other gmail account/username into one.)