tuxwiseIn #Thunderbird, when you Search messages in your Inbox (Ctr-Shift-F, or Edit > Find > Search messages…), you can press the "Save as Search Folder" button.
This will create a subfolder in your Inbox that is dynamically populated with the search results, every time you open it. Opposed to filtering and moving messages, this doesn't move them to a different place, out of sight, out of mind.
Tip: Use the feature not just to find interesting things, but also to clean up your Inbox:
Create a "Delete after a few days" search folder, and specify search criteria that find periodical emails; "special offers" by suppliers; and in general anything that you would never want to catch up with, after a few days, because it has a short-lived "best before" date.
Regularly purge the search folder content, and enjoy a cleaner Inbox.
Bruno