Windows Mail allows us to manage more than one e-mail accounts with one program. How to access and the features offered vary. Let's see the Internet Mail Account settings in the [Tools]> [Accounts ...]. Here, users can enter all your e-mail that has to be managed through Windows Mail. Other features of Identity, can be accessed through the [File]> [Identities]> [Manage Identities ...]. Basically, the two features on the same, namely to manage many of your e-mail account in Windows Mail. The difference, this feature allows you to use multiple accounts on multiple computer users (more users with a PC). If you want you can give a password so that others can not access your e-mail message in Outlook. That way, your privacy will be maintained. But if you have a personal computer and do not want the computer is used by another person with the identity of an e-mail her, you can apply a new policy on your Windows. Following way

1. Run Group Policy Editor by clicking [Start], then type gpedit.msc.
2. In the folder Local Computer Policy-User Configuration-Administrative Templates-Windows Components-Internet Explorer, find the setting Identity Manager: Prevent users from using Identities.
3. Double-click settings Identity Manager: Prevent users from using Identities earlier, and then select [Enabled] .
4. Then click [OK] and close the Group Policy window. From now on, users no longer can create, modify, or delete identities. Besides the option [File]> [Switch Identity ...] will be abolished.
5. good luck