I'm using Thunderbird 115.8.1 (64-bit) on Windows 10 with IMAP, a gmail account, all folders are set to sync offline. Two days ago someone sent me a message with a couple of attachments, I read it, it was downloaded ok. Today, working offline, I try to read the same message and I get "The Body of this message has not been downloaded for offline use". Searching for this problem online is insanely frustrating as there appears to be an infinite number of explanations online telling me how to get the message body downloaded. It '''WAS '''downloaded, I was looking at it two days ago! This has been a common problem in Thunderbird for me for several years now. Messages are downloaded, read, I go offline, they are still there ok, then a few days later they mysteriously say "The Body of this message has not been downloaded for offline use". Fragments of the message bodies appear in search results, even at the same time as trying to read the messages gives me "The Body of this message has not been downloaded for offline use." It's in there somewhere, I can even find the entire message body by searching the data files in the profile folder, but Thunderbird THINKS it's not downloaded. I need to work offline a lot, and any help would be very much appreciated. Thank you for your time.