For those of you who make use of Dynamics Advanced Find functionality, there is some good news.
With Dynamics 365’s 9.0 update Microsoft will be rolling out a ‘Not In’ query which will allow you to search for records which don’t contain a specific value. This is definitely a highly requested feature and something which should make a good quantity of queries a lot simpler.
More information can be found on Microsofts Dynamics 365 Help Center.