Thunderbird v115.12.2 (64 bit) Build 20240621154414 Runing on Windows 10. We've noticed an odd behaviour with the replied icon to the left of the subject column in the main Inbox display. Sometimes, the icon is present for messages we've replied to. Sometimes it appears and then disappears after another Sync and sometimes, doesn't appear at all for messages we know we've responded to. Introducing the Status column into the main display does not show different results to the icon. If the flag is missing to the left of the subject column, the status only lists the message as read. Firstly, has anyone else experienced this on and off behaviour and secondly, what specific feature needs to be present on the server to fully support the replied flag? I'm hoping it's a server issue that we can raise with our provider. Many thanks.