Hi Mickael, I have the same problem. It doesn't seem to be a caching issue, because if I remove the limit, Thunderbird sees all messages in the folder again. But I set the limit again to any value > 1000 (e.g. 5000), Thunderbird stops at 1000 messages, regardless. Is there a hard limit of 1000 in the code, maybe for performance reasons? Regards, Adrian