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Join UsVersion 45.0, first offered to channel users on April 12, 2016
Add a Correspondents column combining Sender and Recipient
Much better support for XMPP chatrooms and commands.
Improved options for remote content exceptions (but previous settings based on the sender's email address are not migrated, so these need to be added again by users).
Allow spell checking and dictionary selection in the subject line
Add dropdown in compose to allow specific setting of font size.
Return/Enter in composer will now insert a new paragraph by default (shift-Enter will insert a line break)
Implement option to always use HTML formatting to prevent unexpected format loss when converting messages to plain text.
Mail.ru supports OAuth authentication.
Allow copying of name and email address from the message header of an email
Allow editing of From when composing a message.
Use OpenStreetmap for maps (even allow the user to choose from list of map services)
Fixed: When sending e-mail which was composed using Chinese, Japanese or Korean characters, unwanted extra spaces were inserted within the text.
XMPP had connection problems for users with large rosters
Spell checker checked spelling in invisible HTML parts of the message.
When saving a draft that is edited as new message, original draft was overwritten.
External images not displayed in reply/forward
Crashed in some cases while parsing IMAP messages.
"Open Draft"/"Forward"/"Edit As New"/"Reply" created message composition with incorrect character encoding.
Copy/paste from a plain text editor lost white-space (multiple spaces/blanks, tabs, newlines)
Properly preserve pre-formatted blocks in message replies.
Fixed: Grouped By view sort direction change was broken, plus enabled custom column grouping.
Fixed: New emails into a mailbox did not adhere to sort order by received.
Fixed: Box.com attachments failed to upload.
Fixed: Drag and drop of multiple attachments failed to OS file folder.
Various security fixes
Outlook and Eudora import non-functional.
UI elements become larger when moused over on retina displays/monitor on Mac OS X or windows moved between lowdpi/hidp.