Exporting inbox and viewing elsewhere

Sure. The easy way is to use windows file explorer. exit thunderbird, locate the message file in the profile, COPY it and then paste it into the Mail\Local Folders folder of the other PC. OR, you could use the addon, importexporttools NG, to export the mbox from one computer and then import it on to another. Just highllight the message folder and right click and select the importexport option to export mbox on first pc and highlight local folder on other PC and rightclick and select import. AND, if t he other computer isn't using thunderbird, use the online tool to read mbox files at https://www.mbox-viewer.com/