SITUATION: Last night my old 32-bit processor was replaced with a 64-bit processor, a 250 Gbyte SSD was installed, and a new Windows 10 operating system was installed. My old drive C became drive D. After the nice computer tech left at 9 pm, I downloaded and installed application software that I need for my work, including Thunderbird. This morning I connected Thunderbird to my gmail account and local ISP email account (to check for urgent messages). I have reviewed the procedures for transferring Thunderbird data (Profiles, Roaming, etc.) and have saved my current data in a temporary location for safety. My old Thunderbird data included archived messages going back about 20 years as well as address books containing important contacts on six continents. PROBLEM: I cannot find my old Thunderbird data on the old drive C/new drive D. I have searched the drive for folder names including Thunderbird or Profiles (50+ such folders) or Roaming without success. QUESTION: How might I find the old Thunderbird data (with important messages to me before 7 pm yesterday evening)?