I have been using Thunderbird Portable e-mail under Windows 10 for a number of years . About 4 months ago I installed on a Windows 11 computer - it worked for a few weeks, then one morning I received a message stating it will not run because a 16 bit program will not run in a 64 bit environment. I am hoping that there will be a 64 bit portable version for Windows, based on my previous usage. Would I be able to install the normal version on an external portable drive? When I go visiting, it is convenient to be able to take just the external drive. Currently, the external drive is a high capacity USB drive. However, if this is not possible, is the current Windows 11 version ready to go? My current e-mail system is a long time DOS system via my ISP. That e-mail address is my only e-mail address, used for over twenty years. I would prefer not to have to change it. What I have been doing is to use Thunderbird Portable to download my e-mails into Thunderbird on my computer, which allows me to store my e-mails offline for a financial year. I am hoping to find an option to continue this by June 30. Regards and Thank you, Kevin Cassidy [edited email from public community support forum]