Contacts and addresses saved in .mab files from various Mozilla programs (like Thunderbird) can be exported in many contact/address exchange formats, including the LDIF format as well as CSV or TAB. This can be done for example using Thunderbird contacts export function from the address book.
Convert Mozilla address book to LDIF address book interchange format.
We found one software available in the database for this conversion.
Microsoft Windows software - convert mab to ldif on Windows
An easy to use e-mail client from Mozzila
Convert from mab file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.