Google Multiple Sign-in, Now Available

Google Multiple Sign-in, Now Available

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Google is rolling out a feature - signing in to multiple Google accounts simultaneously from the same browser. When you go to the Google accounts page, you might see a new option: "multiple sign-in". If you don't see the new feature, it will probably be enabled soon.

After clicking on the "change" link, Google informs that this is an advanced feature and that it will 

Only work for Gmail, Google Calendar, Google Sites, Google Reader, Google Voice, App Engine and Google Code. When multiple sign-in is enabled, a drop-down is displayed next to your email address at the top of the page, so you can quickly switch to a new account.

"If you use multiple sign-in, the first account you sign in to will be your default account. If you visit other Google products that don't support multiple accounts after you've signed in, you willautomatically sign in to your default account for that product. If you sign out of any Google product while signed in to any account, you will be signed out of all your Google Accounts at once." (Google help center)

When you enable this feature, the most significant change is that you'll see a new drop-down next to your email address in Gmail and other supported Google products. Click on the drop-down and you can sign in to a new Google Account without signing out from the previous account.

Another change is that Google's URLs include a different number for each account:http://mail.google.com/mail/u/0/, http://mail.google.com/mail/u/1/, etc.

Google's help center explains that Google's services didn't allow you to sign it to multiple accounts at the same time using the same browser because Google uses sign-in cookies that only let you sign in with one account at a time. Obviously, you can use multiple browsers, Chrome's incognito mode, IE8's "new session" feature, multiple profiles, but the new Google feature makes things easier. Now you can read your messages from two or more Gmail accounts by opening Gmail in multiple tabs.

There are some known issues related to multiple sign-in: this feature is not available on mobile devices, Google Calendar's gadget doesn't work properly in Gmail, you can no longer use offlineGmail and offline Google Calendar and the "note in Reader" bookmarklet only works for the default account.