I periodically backup my Thunderbird AppData information: C:/Users/<me>/AppData/Roaming/Thunderbird I believe I installed Thunderbird from the MS Store. On one device (MS Surface Go, Windows 11), this directory does not seem to exist. I have hidden folders visible, and several folders show up under AppData\Roaming, but not Thunderbird. I tried using %APPDATA%\Thunderbird, which works on my other devices, but the result is "not found". I created a local folder ("save") and then used "properties" to display its location: mailbox///C:/Users/<me>/AppData/Roaming/Thunderbird/Profiles/pv771buo.default-release/Mail/Local Folders/Save When I put this into the file explorer and hit return I get told there is no app to open this 'mailbox' link, and I should look for one on the MS store. When I remove the mailbox/// it gives me the "not found" dialog. I used the help->troubleshooting dialog to "Open Folder" under the Profile Folder entry, and got a "Location is not available" dialog. The dialog cited the same folder path as given above. Where is the Thunderbird App Data stored? How do I access it????