One of the common challenges upgrading a multi-farm MOSS 2007 (Parent/Child) deployment to SharePoint 2010 was the introduction of new service application architecture and planning for downtime upgrading MOSS 2007 parent farm to a new SharePoint 2010 provider. With the release of SharePoint 2013 the good news is that SharePoint 2010 consuming farms are now able to leverage SharePoint 2013 service apps through federation (Note. This only works one way and a SharePoint 2013 farm can not consume services from a SharePoint 2010 provider).
In this post I provide a step by step guide on how to upgrade a SharePoint 2010 MMS to SharePoint 2013 and then federating the service to an existing SharePoint 2010 farm.
In next blog post I will cover upgrading SharePoint 2010 User Profile service application to SharePoint 2013.