how do I auto deleate mail on server after so many days. Like in version 35
The instructions in "account settings/Synchronization and storage" make no sense to me. What does Synchronize all messages locally mean. No definition found in help pages. Also, second section on old messages is also confusing. I don't want to delete old messages on my machine, I want to delete them on the server only. My old version of TB allowed me to delete emails after so many days. very clear instructions.
Also, what is a "folder subscription"?
ప్రత్యుత్తరాలన్నీ (1)
I didn't think those settings had changed. What is stopping you from setting the current version to work like the old one?
Have you set up the same account again in a newer version of Thunderbird? Did you not just keep the old profile?
I wonder if you have used a POP connection in the past and now are seeing unfamiliar terminology relating to an IMAP-connected account?
With IMAP, you store messages on the server. You create your folders on the server. You can choose whether or not Thunderbird connects to particular folders - this is subscription. When you do subscribe, you can choose to have copies of the message stored locally in Thunderbird - this is synchronization. Synchronization means you have local copies that you can refer to when offline or disconnected, and makes searching and browsing faster.
IMAP doesn't really work with not leaving messages on the server, because using the server for storage is its whole raison d'être. You can achieve this by moving such messages to another place outside the IMAP-connected account's folders, such as the Local Folders account in Thunderbird.