It would have been easier to copy and paste the ~/Library/Thunderbird folder containing all data from one MAC to the other MAC. Thunderbird would have to closed whilst doing it.

All the 'Tags' are in the the 'prefs.js' file. 'prefs.js' file can be opened using a text editing program like 'Notepad' the new default one will have some default tags. Each tag will have a colour and a tag name. eg:

• user_pref("mailnews.tags.$label1.color", "#FF0000");
• user_pref("mailnews.tags.$label1.tag", "Important");

It would require you making a copy of the new 'prefs.js' as a backup - just in case :)

• Access the old 'prefs.js' file,
• copy the entire section/ block of 'mailnews.tags'

• Access new 'prefs.js' file
• Remove all the default tags
• Carefull Paste in the copied 'mailnews.tags'
• Save file.

thank you so much, my problem is solved

fani-lab said

I have already transfer all my e-mails (with importexporttools) and create new tags -similar to my old Mac- but all the old tags, after the 3rd, despaired.