Hello, I have now began syncing my O365 mailbox with Thunderbird. As it stands, there is nothing custom or any add-ons setup for this, this has been done completely from scratch running through the new mailbox walkthrough within Thunderbird. This has worked, and I'm able to send/receive emails. However, this has been setup for a few weeks now, and it still appears that Thunderbird is actively syncing through my emails (syncing through Inbox, Sent, etc. and then back to the start again). As a result, this is causing a delay before my emails come in and also making my Thunderbird client very slow. Is there anything I can do to fix this? Thanks in advance, much appreciated :)