New features

• Automatic spell checking and right-click suggestions in message editor's Subject and other text header fields
• Manual spell check now checks header fields before the message body
• Option to check for beta releases alongside regular update checks (DNS TXT + version-info-beta.xml)
• Updater downloads translated "What's New" changelog for the UI language and shows it in the update dialog
• Ctrl+right-click on address fields selects the address under the cursor

Improvements

• New component for message print preview
• Syntax highlighting for previews of attached text files (.ini, .md, .html, .xml) in Conversation View
• Improvements to the interface customization dialog (search and drag-and-drop support)
• MSI installer now removes the previous same-bitness installation before installing
• The active area around the close button for tabs in the account/folder tree and message list has been increased

Fixes

• Error messages appeared when previewing .xlsx files
• Icons in the "Options" menu in the Editor were not highlighted when active
• Certain strings in the Address History were truncated
• Incorrect initial display of iCalendar (.ics) file contents led to improper event import into the Calendar
• Message list tabs appeared smaller on 4K monitors
• Fixed popup menu placement in CEF-based views on high-DPI and multi-monitor setups
• Fixed text scaling in the Print Preview dialog
• Fixed truncated strings in Print Preview
• .mbox export/import did not preserve the received time
• National characters in the message body were displayed incorrectly after viewing attached files
• An Access Violation error message occurred when viewing a PDF attachment
• App exit could not be canceled when closing the app with an unsaved message
• Color groups could not be reset in IMAP accounts
• Compressed table lines were rendered incorrectly in PureHTML messages
• Calendar ICS description field was not imported correctly
• Wrong decoding of Cyrillic headers when imported from Outlook
• Improperly decoded folders' names in Cyrillic when imported from Outlook 2019
• The red wavy underline indicating spelling errors flickered on and off after each key press in MicroEd
• The color palette did not scale properly and remained small at 4K resolution with 200% scaling
• Ctrl+F incorrectly opened two search panels in the Classic View