What OS are you using ? What version of Thunderbird are you using?

re : my TB TRASH folder

Is that 'TB Trash' folder just called 'Trash' or 'TB Trash' or 'Deleted Items' etc? Has that 'Trash' folder been renamed to eg: 'Deleted' ?

Is it the 'Trash' / 'Deleted ' folder in an imap account that's connecting to a Microsoft outlook server ?

• Right click on 'Trash' folder and select 'Properties'
• Under 'General Information'
• Is this selected : 'When getting new mesasges for this account always check this folder' ?

• See if a folder repair helps : Click on 'Repair Folder'
• Click on 'OK'

Did a repair help to fix issue?

Have you compacted the 'Trash' folder to see if it clears old data ? Right click on Trash folder and select 'compact'.

re : You might be able to view it using either 'Outlook' or 'Outlook Web App'.

the word 'might' is just a maybe not a definite yes. I thought outlook.com deleted items from the Trash/Deleted Items folder after 30 days. I notice the email itself is a year old.

'Outlook' means they are trying to get you to swap over to use the Microsoft Office email client product called 'Outlook'. 'Outlook Web App' (OWA) means using a browser - logon to your webmail account to see emails on server.

It would be worth seeing if those emails really are still on the server - using a browser like Firefox logon to your webmail account to see if they really do exist. Report back on whether emails really are on server in the Trash.

1. What OS are you using? Windows 25H2 2. What version of Thunderbird are you using? 146.0 (64-bit) 3. re : my TB TRASH folder: The TRASH folder in outlook.live.com is called DELETED. In TB it is called TRASH but that folder appears to be mapped to \deleted folder in outlook.live.com (imap://dalewebb1%40outlook.com@imap-mail.outlook.com/Deleted) 4. Has that 'Trash' folder been renamed to eg: 'Deleted' ?: See #2 5. Is it the 'Trash' folder in an imap account that's connecting to a Microsoft outlook server?: See #2 6. 'When getting new messages for this account always check this folder'?: I was not, but it is now. 7. Did a repair help to fix issue?: Did the repair, we'll see 8. Have you compacted the 'Trash' folder to see if it clears old data? Did that, we'll see 9. You might be able to view it using either 'Outlook' or 'Outlook Web App': There are a bunch (10-12) of files in the Inbox on outlook.live.com. I don't know why they are there as I have TB set to delete them after fetching new mail. Confused 10. It would be worth seeing if those emails really are still on the server Report back on whether emails really are on server in the Trash: There are a large number of messages in the OWA DELETED folder. Not sure if they correspond exactly to the list of error messages. If TRASH folder in TB is linked to OWA DELETED folder, shouldn't TB have pulled them down?

9. You might be able to view it using either 'Outlook' or 'Outlook Web App': There are a bunch (10-12) of files in the Inbox on outlook.live.com. I don't know why they are there as I have TB set to delete them after fetching new mail. Confused

If you have an Imap account, then it synchronises to show exactly what is on server. So whatever is in server 'Inbox' should also be in imap account Inbox. Same for all imap account folders. If you downloaded and then deleted them they would disappear from the imap Inbox.

The option to download from Inbox and delete off server applies to POP accounts.

Account Settings > Server Settings Bottom right under 'Message Storage' There is a checkbox you can select 'Empty Deleted folder on Exit'