How to get Thunderbird Address Book export to default to LDIF file format? Each time I export the address book it defaults to CSV format and I have to manually change it LDIF. Thanks for your continued support of an incredible product! I'll keep up my annual donations to Mozilla ($100) and to the Thunderbird team ($500). '''Why do I want this?''' I export my address book as LDIF several times per day. As I said at: - https://bugzilla.mozilla.org/show_bug.cgi?id=1935803 I am a SERIOUS Thunderbird user. A user for 30 years (counting a decade of Netscape Messenger). I currently have about 500,000 messages in nearly 1,000 folders, and an address book of nearly 4,000 entries. I spend several hours per day in Thunderbird, reading and sending email, reading technical and financial newsletters, plus current news and events, etc. Talking to clients, colleagues, friends and family. But, I also have significant home-grown email infrastructure. I use it for mass-mailings of tips to the thousands of subscribers on my various mailing lists. I manage all of the mailing lists via the UI of Thunderbird, export them as LDIF files, and use home-grown software to read the LDIF files and generate the mailing list format used by my custom software. Thunderbird is VASTLY superior to Outlook, Gmail, or any of the other alternatives! Not only in terms of feature set, but also speed, reliability, standards compliance, Unix-style use of plain text for portability, etc. For more info about my usage of Thunderbird, see: - https://bugzilla.mozilla.org/show_bug.cgi?id=1935803 Thanks! --Fred