I use Verizon.net whish has long been aliased to AOL.com and “pop” it down to Tbird. This has worked flawlessly for many years. On 01/24/2025 I was routinely clearing my inbox and got this message. “The message could not be moved or copied to folder ‘Trash on rtegethoff@verizon.net because writing folder failed. To gain disk space, from the File menu, first choose Empty Trash, and then Compact Folders and then try again.” I assumed this meant my Inbox folder was too big so I attempted to Delete one and then a number of old emails but got this same message. I thought maybe my Junk or Trash folders were too big so I managed to Delete all messages and Compacted both folders. With both Junk and Trash folders cleared to zero, I still got the above message when I tried to Delete a message from my Inbox. When I request new messages from AOL/Verizon email server I see the first 1 or 2 messages but then the above message appears and no new messages appear in my Tbird Inbox. When I log on directly to this account that is aliased on AOL.com I see many new messages. Next I tried to send a message using Tbird to my gmail.com account and the message is received at gmail.com but there is no new entry my Tbird Sent folder. I am running WINDOWS 10 McAfee Antivirus Version 1.25.208 16.0.R125 and I turned off the McAfee software and still failed. I, also, ran the PC in SAFE MODE and still failed. I am running Tbird version 128.6.0esr. There is an update listed as 128.6.1esr and I attempted to update but again got the same above message. Any help resolving this issue would be greatly appreciate