- IMAP label names can now be customised.
- New quick search active icon indicator added.
- Calendar accounts can be dragged in calendar store view to re-order them.
- New admin tool for v4.
- Fixed bug with failure to print in the mailbox pane.
- Fixed bug with missing items in help.
- Fixed bug with incorrect version number.
- Fixed bug with inline decrypt/verify not changing message text.
- Fixed bug with quick search state restore when switching tabs.
- Fixed bug with non-ascii characters in application path name.
- Fixed bug with various edit fields in dialogs not being editable.
- Fixed bug with incorrect wrapping when using certain fonts.
- Fixed bug with crashes when replying/forwarding messages when the original message mailbox is reset.
- Fixed bug with missing spelling plugin causing a crash in preferences dialog.
- Fixed bug with incorrect line end encoding in generated iCalendar data.
- Fixed bug with scroll bar arrows moving more than one line at a time.
- Fixed bug with failure to expand multiple emails from OS X address book.
- Fixed bug causing a crash when an empty webcal URL was used.
- Fixed bug with recurring calendar items not always including the initial instance in the recurrence set.
- Fixed bug when dealing with x509 certs with multiple email addresses.
- Fixed bugs with spelling checking of non-ascii text.