I have been a Thunderbird user for several years. Please let me know how I can have 2 different versions of Thunderbird on same PC (Windows-10) ? Each version using different email accounts. What are the steps, and configuration I would need to do to accomplish this ? My Objective: The slightly older (stable) version will be for my normal important email. The 2nd newer version will be like my test version which I will use for checking/testing upgrades to a new version. Once I have used/tested the new version on a test email account, then will upgrade the normal version. And the process will repeat. Thank you.