Learn how to use SharePoint 2013 search with your SharePoint 2010 farm. Practical use of this scenario will be when upgrading big SP 2010 farms where entire farm cannot be upgraded at once.
21. Basics of cross version support
• Only federated services supported this:
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Search
Profile
Social Secure Store
Managed Metadata
BCS
• 2010 services farm can be used while verifying upgrade of federated
services
• SP 2013 farm can be used once
• SP 2013 farm should be first farm upgraded as best practice