- Mozilla Thunderbird 68.4.1
  * Various improvements when setting up an account for a Microsoft
    Exchange server: Now offers IMAP/SMTP if available, better
    detection for Office 365 accounts; re-run configuration after
    password change
  Fixes:
  * After changing view layout, the message display pane showed
    garbled content under some circumstances
  * Various theme changes to achieve "pixel perfection": Unread icon,
    "no results" icon, paragraph format and font selector, background
    of folder summary tooltip
  * Tags were lost on messages in shared IMAP folders under some
    circumstances
  * Calendar: Event attendee dialog was not displayed correctly
  MFSA 2020-04 (bsc#1160498, bsc#1160305)
  * CVE-2019-17026 (bmo#1607443)
    IonMonkey type confusion with StoreElementHole and FallibleStoreElement
  * CVE-2019-17015 (bmo#1599005)
    Memory corruption in parent process during new content process
    initialization on Windows
  * CVE-2019-17016 (bmo#1599181)
    Bypass of @namespace CSS sanitization during pasting
  * CVE-2019-17017 (bmo#1603055)
    Type Confusion in XPCVariant.cpp
  * CVE-2019-17021 (bmo#1599008)
    Heap address disclosure in parent process during content process
    initialization on Windows
  * CVE-2019-17022 (bmo#1602843)
    CSS sanitization does not escape HTML tags
  * CVE-2019-17024 (bmo#1507180, bmo#1595470, bmo#1598605, bmo#1601826)

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