Hi, I Changed IMAP to POP3, rebuilt Inbox.MSF and it worked for a few hours. Now, I cannot get control of the Thunderbird screen (it is grayed out and "the wheel is turning") I've also tried to Shift click to start Thunderbird to start in Troubleshoot mode and checked both boxes. (I get control for approximately 15 seconds). I am running Windows 11 with 128 Gb of RAM and enough disk space. What should I do now? BTW, I am an I/T professional, so you may use jargon in your response. Thank you in advance.