I'm trying to understand the options available for integration with mobile phones, but the zimbra website is very confusing. They offer "Zimbra Mobile Edition" which is
compatible with Zimbra Collaboration Suite 4.5+ Open Source and Network Edition and can be used for free
However, they also offer to sell me "Zimbra Mobile" for $1,000. Are these two seperate products/services? If so, why do they have the same name? Is the difference that the solution you must pay for is compatible with more phones, doesn't require a java program be installed, or integrates better with the phone? Is the non-free option compatible with Zimbra open-source?