I figure this would be the easiest way to remedy what my problem is. After doing a test import from IPB 3.1.2 I found that I had a huge moderation queue (4.5k) and a huge amount of unread conversations (4.3k). I can pretty much remedy the moderation queue by taking care of it before I fully convert but inboxes are another issue. From what I'm noticing, even after running the query I found to mark all as read, all 4.3k conversations still load into the inbox dropdown. Therefore, unless there is a way to remove them all since, as far as I know, they should only be recent conversations, I would have to either limit the # shown or try and disable the dropdown until they no longer count as recent. Any input would be greatly appreciated!