About 6 weeks ago, I was forced to change my Thunderbird (v115.14.0) setting for my POP Outlook (formerly Hotmail) account to use OAuth2. Per the instructions, I backed up my profile, deleted the account and reinstalled it with the previous profile files, using the server name Outlook.office365.com as directed. I also have backups of the profile under appdata going back several years. I now find that the only emails from that account are those received within the last 6 weeks. Under appdata\Thunderbird\Profiles..., I see three directories: Outlook.office365.com, Outlook.office365-1.com, and Outlook.office365-2.com, all of different sizes. Also, under localhost, I see an even larger Inbox, Sent, etc. that appear to contain at least one of the missing emails, so I suspect that that is the location of the missing mail. This is complicated by the fact that I have an email account through another company that also uses the server Outlook.office365.com. I've tried changing the local directory under the server settings for the Hotmail account to each of the different Outlook.office365.com directories, but I still cannot see the old emails. Can you help me to retrieve the old emails and place them in the same account? Or failing that, at least make them available in some other way? Thanks.