Following a bereavement I need help with all the technology that my partner managed for us both.

Following a bereavement I am struggling (at 80 yrs old) to deal with all the technology that my partner managed for us both. Everything is dependent upon technology now so I am terrified that your security may delete my use of Thunderbird for all my emails. I also need to know how to have my Thunderbird messages on my laptop synchronised with my Android phone please as I keep having to repeat deletion etc on other devices.