These days every body maintains 2 or above mail accounts, it is because of privacy and to avoid spamming. Unfortunately we face issue logging in simultaneously to both the accounts. Here is the fix I would like to suggest.
If you have Safari browser you can open one e-mail account in safari browser and the other in the Internet explorer.
Download Safari Browser.

To perform multiple ids Login at the same time you need firefox mozilla browser If u don't have mozilla u can download it .


Step 1:
Open system properties (by right clicking my computer), choose tab advanced, click to environment variables button. In system variables section, click new. Type this information to each textbox.

Variable name: moz_no_remote(should be all small letter)
Variable value: 1
Press ‘OK’ to close all windows.

Step 2:
Open firefox icon's properties (from desktop and quick launch). Add extension -p to command line (like "c:\program files\mozilla firefox\firefox.exe" -p). Press ok.

Before starting firefox you have to create two separate profiles of firefox so that u can login to two accounts of any mail ids like orkut,yahoo, gamil or etc.,.......
For three logins create three profiles of firefox.........