Need to extract all Tags used only from Project1.
Release : SAAS
You can use Custom List 2.0 to select Project1 and the work item types. In the Query field, you can filter out work items without any tags: (Tags.Name != "") Make sure you have the Tags field displayed in your view, then you can export the list.
Customers will want to limit the amount of fields in their view as much as possible. If the query or export are unable to complete before the timeout period, you will need to break it up, perhaps by work item type.