It seems it doesn't support APIs, cannot create user, cannot change password, etc. forum.mailenable.com keeps the answer as secret.
If oLogin.getLogin() Then
oLogin.Password = newpass
ChangeResult = oLogin.EditLogin(oLogin.UserName, oLogin.Status, oLogin.Password, oLogin.Account, oLogin.Description, 0, 0, 0, oLogin.Rights)
End If
ChangeResult may contain 1 (success) but the result might not be OK in real; that's what my problem is.
This API gudie shows the commands you are able to use PDF for API
No. Standard Edition does not support API's. Professional and higher versions support. I've installed Pro, when the trial ends it becomes Standard and then won't support APIs anymore.