1. Remove the user account from your Office 2013 profile In the upper-right corner of the Office 2013 app 
  2. Click your name, and then click Switch Account
  3. On the Accounts screen, click Sign out. Locate the account that you want to remove, and then click Sign out
  4. Remove connected services from your Office 2013 profile. Go to File, and then click Account. Under Connected Services, remove all the services for the existing account
  5. Clear cached credentials on the computer. Edit the registry to remove cached credentials

    Note: To do this, follow these steps.
    1. Click Start, click Run, type regedit, and then click OK
    2. In Registry Editor, locate the following registry sub-key: HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\Identity\Identities 
    3. Select the Office account that you want to delete, and then click Delete
    4. In the Identity sub-key, locate Profiles, right-click the same Office account that you deleted in step A3 of this procedure, and then click Delete
    5. Exit Registry Editor. Remove the cached credentials in Credentials Manager
    6. Open Control Panel, and then click Credentials Manager
    7. Under Generic Credentials, locate the account that you want to remove, and then click Remove. Log off, and then log on to the computer