New answers tagged aggregation
For me you have to use an SPSiteDataQuery to perform operation across multiple webs in the same site collection. Here is doc from msdn with working example : MSDN Artcile
This is what the Work Management Service is for. On the User Profile Tasks page it accumulates the tasks from SharePoint, Project Server Sites and Exchange 2013 (if you have that and it's connected). Warning though, it has been removed from SharePoint 2016 and Office 365. Reference: http://social.technet.microsoft.com/wiki/contents/articles/12525....
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