+ If more than one message file is associated with a message-id,
+ `notmuch search --output=files` will print all of them. A new
+ `--duplicate=N` option can be used to specify which duplicate to
+ print for each message.
+
+ `notmuch count` now supports `--output=files` option to output the
+ number of files associated with matching messages. This may be
+ bigger than the number of matching messages due to duplicates
+ (i.e. multiple files having the same message-id).
+
+Improved `notmuch new` performance for unchanged folders
+
+ `notmuch new` now skips over unchanged folders more efficiently,
+ which can substantially improve the performance of checking for new
+ mail in some situations (like NFS-mounted Maildirs).
+
+`notmuch reply --format=text` RFC 2047-encodes headers
+
+ Previously, this used a mix of standard MIME encoding for the reply
+ body and UTF-8 for the headers. Now, the text format reply template
+ RFC 2047-encodes the headers, making the output a valid RFC 2822
+ message. The JSON/sexp format is unchanged.
+
+Emacs Interface
+---------------
+
+`notmuch-tree` (formerly `notmuch-pick`) has been added to mainline
+
+ `notmuch-tree` is a threaded message view for the emacs
+ interface. Each message is one line in the results and the thread
+ structure is shown using UTF-8 box drawing characters (similar to
+ Mutt's threaded view). It comes between search and show in terms of
+ amount of output and can be useful for viewing both single threads
+ and multiple threads.
+
+ Using `notmuch-tree`
+
+ The main key entries to notmuch tree are
+
+ 'z' enter a query to view using notmuch tree (works in hello,
+ search, show and tree mode itself)
+
+ 'Z' view the current query in tree notmuch tree (works from search
+ and show)
+
+ Once in tree mode, keybindings are mostly in line with the rest of
+ notmuch and are all viewable with '?' as usual.
+
+ Customising `notmuch-tree`
+
+ `notmuch-tree` has several customisation variables. The most
+ significant is the first notmuch-tree-show-out which determines the
+ behaviour when selecting a message (with RET) in tree view. By
+ default tree view uses a split window showing the single message in
+ the bottom pane. However, if this option is set then it views the
+ whole thread in the complete window jumping to the selected message
+ in the thread. In either case command-prefix selects the other option.
+
+Tagging threads in search is now race-free
+
+ Previously, adding or removing a tag from a thread in a search
+ buffer would affect messages that had arrived after the search was
+ performed, resulting in, for example, archiving messages that were
+ never seen. Tagging now affects only the messages that were in the
+ thread when the search was performed.
+
+`notmuch-hello` refreshes when switching to the buffer
+
+ The hello buffer now refreshes whenever you switch to the buffer,
+ regardless of how you get there. You can disable automatic
+ refreshing by customizing `notmuch-hello-auto-refresh`.
+
+Specific mini-buffer prompts for tagging operations
+
+ When entering tags to add or remove, the mini-buffer prompt now
+ indicates what operation will be performed (e.g., "Tag thread", "Tag
+ message", etc).
+
+Built-in help improvements
+
+ Documentation for many commands has been improved, as displayed by
+ `notmuch-help` (usually bound to "?"). The bindings listed by
+ `notmuch-help` also now include descriptions of prefixed commands.
+
+Quote replies as they are displayed in show view
+
+ We now render the parts for reply quoting the same way they are
+ rendered for show. At this time, the notable change is that replies
+ to text/calendar are now pretty instead of raw vcalendar.
+
+Fixed inconsistent use of configured search order
+
+ All ways of interactively invoking search now honor the value of
+ `notmuch-search-oldest-first`.
+
+Common keymap for notmuch-wide bindings
+
+ Several key bindings have been moved from mode-specific keymaps to
+ the single `notmuch-common-keymap`, which is inherited by each
+ notmuch mode. If you've customized your key bindings, you may want
+ to move some of them to the common keymap.
+
+The `notmuch-tag` function now requires a list of tag changes
+
+ For users who have scripted the Emacs interface: the `notmuch-tag`
+ API has changed. Previously, it accepted either a list of tag
+ changes or a space-separated string of tag changes. The latter is
+ no longer supported and the function now returns nothing.
+
+Fixed `notmuch-mua-reply` point placement when signature involved
+
+ By restricting cursor movement to body section for cursor placement
+ after signature is inserted, the cursor cannot "leak" to header
+ section anymore. Now inserted citation content will definitely go to
+ the body part of the message.
+
+Notmuch 0.16 (2013-08-03)
+=========================
+
+Command-Line Interface
+----------------------
+
+Support for delivering messages to Maildir
+
+ There is a new command `insert` that adds a message to a Maildir
+ folder and notmuch index.