@sarajaynerow - As @StanGromer mentioned, there is no OOTB way to do this, but this can be customised to achieve this for specific roles. Let me know if you'd like to know/ talk more about this, we do have some examples around this.
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@SorchaCantwell - The OOTB limit max outs on 200 per move. This is the only way apart from a custom solution that could allow for a faster migration of the threads. We have developed a custom solution for the bulk migration of the threads which performs multiple other actions as well in bulk. Let me know if you need more details.
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@MacLit - Most of what you are looking for is something not available as a part of standard search and would require a custom solution. Let me know and I can share some more details over the PM.
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