If you are a Google Apps admin, you can install Cacoo for Google Apps for free from here.

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By using Cacoo for Google Apps, you can:

1. Use single-sign on to access Cacoo using your Google Apps account

2. Access Cacoo from the link on the global bar

Access Cacoo from the link on the global bar

3. Show an in-line diagram when you paste the URL of a diagram in the email body