Hello, I'm using and working frequently alternatively on two different boots on my computer (Windows 7 x64 and Windows 11) because I have no other choice (for software compatibility reaons). All my mail archives (more than 20 years) have been transfered trhough the years from several machines and softwares to one Thunderbird instance on the Windows 7 x64 system. I have also 12 differents active email adresses (personnal, business, associative, etc). Knowing that some emails are configurated with pop servers and some others with imap. And this could not change. Ideally, I simply need to install another Thunderbird instance on the Windows 11 boot, and I would like this thunderbird to load and save all new mail data on the folders situated in the windows 7 x64 drive. Or in the worst case, to create an exact copy of the windows 7 x64 thunderbird on the windows 11 boot, but I need that when I'm on Win 11, all my written mails, including all drafts, sent mails on pop accounts, every single data should be also synced permanently on the windows 7 thunderbird, such as when I'm working on the Win 7 boot, I get everything exactly like on win 11, and when I'm working on the Win 11 boot, I get everything exactly like on win 7. Notice that I need to continue to use pop accounts in order to get emails archive saved into my hard disks, this system is far more reliable than imap for achiving from my +20 years experience. I just want a permanent and integral sync between the two boots, or better, exploit directly all the contents on my windows 7 boot, without the need of copying everything and syncing everything and multiplicate the enormous amount of email datas on 2 hard drives. Is there a simple solution for that ?