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| 1 | +release: |
| 2 | + release_date: '2025-12-09' |
| 3 | + text: | |
| 4 | + **System Requirements:** [Details](/en-US/thunderbird/146.0/system-requirements/) |
| 5 | +
|
| 6 | + - Windows: Windows 10 or later |
| 7 | + - Mac: macOS 10.15 or later |
| 8 | + - Linux: GTK+ 3.14 or higher |
| 9 | +
|
| 10 | + import_system_requirements: 140.0esr |
| 11 | + |
| 12 | +notes: |
| 13 | + # New |
| 14 | + - note: Enabled configuration of preferred OpenPGP keyserver via the UI |
| 15 | + tag: new |
| 16 | + bugs: [1665723] |
| 17 | + |
| 18 | + # Changed |
| 19 | + - note: Existing logins are migrated to make use of more modern AES cryptography |
| 20 | + tag: changed |
| 21 | + bugs: [1985684] |
| 22 | + |
| 23 | + # Fixed |
| 24 | + - note: Memory was not cleaned up after opening New Window from folder pane context menu |
| 25 | + tag: fixed |
| 26 | + bugs: [1994088] |
| 27 | + - note: Thunderbird could crash in server subscription logic |
| 28 | + tag: fixed |
| 29 | + bugs: [1835523] |
| 30 | + - note: Importing a vCard only displayed VCF files in the file picker |
| 31 | + tag: fixed |
| 32 | + bugs: [1995926] |
| 33 | + - note: Could not distinguish folders with same name in 'Recent Destinations' and 'Favorites' |
| 34 | + tag: fixed |
| 35 | + bugs: [1829728] |
| 36 | + - note: Could not compose new message if the folder pane was empty |
| 37 | + tag: fixed |
| 38 | + bugs: [1991417] |
| 39 | + - note: "'Delete' was missing from context menu when multiple IMAP folders were selected" |
| 40 | + tag: fixed |
| 41 | + bugs: [1999101] |
| 42 | + - note: "'Delete' button in unified toolbar could delete attachments instead of message" |
| 43 | + tag: fixed |
| 44 | + bugs: [1995417] |
| 45 | + - note: "'Recent destinations' submenu was not sorted by time of modification" |
| 46 | + tag: fixed |
| 47 | + bugs: [1829748] |
| 48 | + - note: Account column could display incorrect account name |
| 49 | + tag: fixed |
| 50 | + bugs: [707165] |
| 51 | + - note: "'Tag' submenu of mail context menu could be populated incorrectly" |
| 52 | + tag: fixed |
| 53 | + bugs: [1997914] |
| 54 | + - note: Extending the expiration date of OpenPGP key set incorrect date |
| 55 | + tag: fixed |
| 56 | + bugs: [2001888] |
| 57 | + - note: Could not sign/encrypt (PGP) when using -compose and Thunderbird was not running |
| 58 | + tag: fixed |
| 59 | + bugs: [1993943] |
| 60 | + - note: Account Hub email success messages were not always accurate about config source |
| 61 | + tag: fixed |
| 62 | + bugs: [1992106] |
| 63 | + - note: Account Hub advanced config setup did not include default outgoing config |
| 64 | + tag: fixed |
| 65 | + bugs: [1973526] |
| 66 | + - note: Account Hub local address book creation could continue with blank name |
| 67 | + tag: fixed |
| 68 | + bugs: [1991902] |
| 69 | + - note: Detailed security exception dialog was not shown when adding certificate exception |
| 70 | + tag: fixed |
| 71 | + bugs: [1988837] |
| 72 | + - note: The default account could be reset after restart if uninitialized |
| 73 | + tag: fixed |
| 74 | + bugs: [1991298] |
| 75 | + - note: Opening a vCard (.vcf) from file manager or CLI did not work in some cases |
| 76 | + tag: fixed |
| 77 | + bugs: [1921406] |
| 78 | + - note: Dragging attachments on macOS to folder or desktop no longer worked |
| 79 | + tag: fixed |
| 80 | + bugs: [1989600] |
| 81 | + - note: EWS folder properties "Select this folder for offline use" did not work |
| 82 | + tag: fixed |
| 83 | + bugs: [1989498] |
| 84 | + - note: Thunderbird could crash when mail folder was renamed or moved |
| 85 | + tag: fixed |
| 86 | + bugs: [1996650] |
| 87 | + - note: Account Hub could fail when manually creating EWS account |
| 88 | + tag: fixed |
| 89 | + bugs: [1998478] |
| 90 | + - note: "'Offline' folder flag for EWS folders was reset on restart" |
| 91 | + tag: fixed |
| 92 | + bugs: [1995078] |
| 93 | + - note: "'Open with' of Microsoft Office attachment did not mark file with MOTW label" |
| 94 | + tag: fixed |
| 95 | + bugs: [1993854] |
| 96 | + - note: Visual and UX improvements |
| 97 | + tag: fixed |
| 98 | + bugs: [1416232, 1901089, 1973072, 1977204, 1997518, 1990434, 1990824, 1992593, 1994194] |
| 99 | + - note: '[Security fixes](https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/#thunderbird146)' |
| 100 | + tag: fixed |
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