Earlier versions of SharePoint Workspace supported creating multiple identities in an account (depending on device policy). If you created additional identities in your account, you can still access those identities just as you did before. The feature is no longer supported in the current release.
If you have more than one identity in your account, you can set any one of these as your default identity. Your initial default identity is the identity created with your account. Your default identity is pre-selected when you create new messages or invitations to a workspace.
On the File tab, click Info, click Manage Account, and then click Account Preferences.
Click the Identities tab.
Select the identity you want to set as the default identity from the Identities drop-down menu.
Click Set as Default.