I have a primary computer which has emails back for several years (Thunderbird). One account is rather important to me and I created it with IMAP on a laptop which I took overseas. When returning, I noted that all of the emails to that date (January 2015) had downloaded onto the laptop Thunderbird for this account. When I accessed the primary computer at home, for some reason it cleared every email I had in my profile up to the date I last used the laptop overseas. All the "Inbox.mozmsgs" seem to be there (whatever *they* are) but all the emails prior to January 2015 are gone in Thunderbird. What I want to do is copy the profile *for this account only* from my laptop and somehow merge that (pre-January) with the same profile account in my desktop (post-January) so that once again I have the full email history on my primary computer, the desktop. I cannot find any explicit instructions on how to accomplish this. I would very much appreciate well thought out assistance. There must be a way - otherwise I will need to set up a virtual machine and create an account on that on my desktop for the pre-January profile, which will be a little tedious). Thanks in advance...