Several profiles problems with both FF and TB - MozillaZine Forums
Thunderbird2 has tag functionality. However, the UI is not good enough. Methods to add tags are annoying if you have many tags. Attached tags are difficult to recognize. Tag Toolbar facilitates the tag functionality.
mails bouncen mit thunderbird
The mailredirect extension for Mozilla Thunderbird (version 0.7 and above) and Mozilla Mail client adds ability to redirect one or more mails to one or more recipients. Feature of mail redirecting is also known as bouncing.
Dawn will convert your address book from one program's format to another.
import vcf into thunderbird