How To Enable Google Multiple Accounts Sign-in Feature
Google is rolling out a new feature, that will allow you sign 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 this new feature under your Google Accounts management page, then it will probably be enabled soon for your account. Google is slowly enabling the “Multiple Sign-In” feature for all Google users.
If you click on the “Change” link (see screenshot above), Google informs you that this is an advanced feature and that it will only work for Gmail (or Google Mail), Google Calendar, Google Sites, Google Reader, Google Voice, App Engine and Google Code. When multiple sign-in is enabled for all your accounts, a drop-down is displayed next to your email address at the top of the page, so you can quickly switch to another new account of yours.
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 will automatically 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.
Warning: Enabling multiple sign-in will disable Offline products like Offline Gmail and Offline Calendar, as well as any browser bookmarks you’ve set to link to your accounts. If you use Offline Gmail, make sure to sync your offline mail before enabling multiple sign-in so you don’t lose any messages in your outbox. If you would like to continue using Offline Gmail, Offline Calendar, and browser bookmarks linked to your accounts, do not enable the multiple sign-in option. If you have already enabled multiple sign-in, you may disable it.
(Source: Google help center)
Of-course, you can use multiple browsers, Chrome’s incognito mode, IE8’s “new session” feature, multiple profiles, etc. as explained at this Google’s help center page. This help page also explains that Google’s services didn’t allow you to sign in to multiple accounts at the same time using the same browser as Google uses sign-in cookies that only lets you sign in with one account at a time.
But with the implementation of the new Google feature “multiple sign-in” is going to make things easier. You can easily now read your messages from two or more of your Gmail accounts by opening Gmail in different multiple tabs.
Thanks to Google Operating System for the update.