Every email client desktop or mobile supports multiple accounts. I'd like to have the same capability from the web mail by having a single login then the ability to add accounts. Many of us maintain multiple accounts such as sales, support, personal, etc. Presently we have to login, use the client, logout and login as another account, etc. I'd like to register multiple accounts in my web client so that I can choose between accounts either from a list that floats from a dock panel on the left or from a drop down in the upper left or right, etc. Think of it like SQL Server Management Studio as well for those familiar where you can register multiple servers.