From 9to5Google:

Earlier today Google officially pushed out an update to its existing Google Search app for iPhone enabling the Google Now service with weather and traffic conditions, updates on breaking news and sports, and more. Some users logging into Google Search through a Google Apps account might have noticed that using the features would prompt an error that “your administrator hasn’t enabled Google Now for your domain.” Hanselman.com shares instructions on enabling the feature which aren’t exactly obvious since the setting is buried in “Android settings”.

Google Apps for Business, Education, and Government: Google Now needs to be turned on by an administrator before it can be used.

If you are an administrator, you can enable Google Now for users in your organization by following these steps:

  • Sign in to your Google Apps control panel.
  • Go to Settings > Mobile > Org Settings > Android settings.
  • Click the checkbox next to Enable Google Now to turn on Google Now.
  • Click Save.