If you have deleted one or more Windows user accounts, and then re-created them with the same name, do the following in order to to use Mobile iManager with the re-created account:
Log in as a member of the Administrator group.
Take ownership of the \system32\novell\nici\ <username> folder. The absolute path varies between Windows 2000 and Windows XP.
Delete the directory.
When the user next logs in, this folder is automatically re-created using NICI keys of the re-created user account, and the user can then run Mobile iManager.