Hi, I'm using Thunderbird on my desktop and on my laptop, on the same IMAP account. On the desktop, it loads all my subfolders correctly and correctly syncs and displays all the new mails (mails are directly put into specific subfolders on the server through sieve scripts). On the laptop, some subsubsub-folders are not sync'd correctly on startup. Usually, the parent folder exists in the tree vieew, but the subfolder (the leaf in the directory tree) doesn't exist. When I double click on the parent folder, the leaf subfolders appear, and when I click on the subfolder name, it then sync's the content of the folder (which can be several thousands of mails and take some time...). Once I did that, the new mails are detected in those folders. It seems like it loads the tree dynamically on the laptop and needs a nudge to start loading everything, whereas on the desktop, it looks like those folders are already cached on startup and Thunderbird knows about it. I'm not sure what the difference is between my setups and how to debug this. Any clue is welcome, Thanks, nab