How can I merge my thunderbird e-mail data from two computers. Transferring data to a new profile - Thunderbird. From MozillaZine Knowledge Base Sometimes when you have problems with Thunderbird and can't figure out what's wrong, it's easier to create a new profile and transfer any data you want to save, rather than keep trying to fix your existing profile.
This article is also useful if you want to merge multiple profiles. If you're using Firefox or SeaMonkey, see Transferring data to a new profile - Firefox or Transferring data to a new profile - SeaMonkey. See Move to a new PC or Moving your profile folder - Thunderbird if your profile is okay and you just want to move it. How to Backup Thunderbird Email on Windows 7. Backing up Mozilla Thunderbird email on Windows 7 is a simple process of archiving your Thunderbird profile.
Follow these steps to backup emails for Thunderbird on Windows 7: Step 1 Close Mozilla Thunderbird.