POP account, not IMAP. Trash messages don't show because the file Trash didn't get copied onto my flash drive. Why it didn't, given that there was plenty of room for it, I don't know.

I also don't know why, given that Trash wasn't copied onto the flash drive, the Trash messages (sans bodies) are even showing.

But those are side issues. I'm not thrilled with your idea because that means that in the future, when I'm searching for some old message, I'll have to look in 2 different places. I guess I'll just move all the deleted messages from my stay here back to Inbox and delete them back home. Even if there are other solutions, it may be the easiest one.

Thanks very much for being there once again.

First, I suddenly realized why Trash wouldn't copy onto the flash drive. It was the (typically misleading Microsoft) message that threw me off. It said that there wasn't enough room on the drive for the file, even though there was way more space than the file's size. The drive comes formatted as FAT32, which has a file size limit of 4GB, while Trash was more than 5GB. Reformatting the drive to NTFS solved that problem.

Second, I refined my idea for integrating my messages deleted in NY with my Trash file here at home. I created a folder which I named To be deleted and moved all my NY deleted messages to that. Had I gone with my original idea of moving them all to Inbox, they would have gotten mixed in with the messages still in Inbox. When I got back home, I made a copy of Trash located on my home computer, replaced the profile on my home computer with that on the flash drive, copied the saved Trash to the new profile and then deleted everything in To be deleted.

I'm left with one annoying problem. Once I no longer had a need for To be deleted, I deleted that folder. But Thunderbird is unaware of that. When I search for a message in Trash, and hover my mouse over Trash, I have to choose between Trash and To be deleted, even though the latter no longer exists.

Any suggestions?