+ The <b>path:</b> prefix searches for email messages that are in particular
+ directories within the mail store. The directory must be specified rel‐
+ ative to the top-level maildir (and without the leading slash). By
+ default, <b>path:</b> matches messages in the specified directory only. The
+ "/**" suffix can be used to match messages in the specified directory
+ and all its subdirectories recursively. <b>path:""</b> matches messages in
+ the root of the mail store and, likewise, <b>path:**</b> matches all messages.
+
+ The <b>folder:</b> prefix searches for email messages by maildir or MH folder.
+ For MH-style folders, this is equivalent to <b>path:</b>. For maildir, this
+ includes messages in the "new" and "cur" subdirectories. The exact syn‐
+ tax for maildir folders depends on your mail configuration. For
+ maildir++, <b>folder:""</b> matches the inbox folder (which is the root in
+ maildir++), other folder names always start with ".", and nested fold‐
+ ers are separated by "."s, such as <b>folder:.classes.topology</b>. For "file
+ system" maildir, the inbox is typically <b>folder:INBOX</b> and nested folders
+ are separated by slashes, such as <b>folder:classes/topology</b>.
+
+ Both <b>path:</b> and <b>folder:</b> will find a message if <u>any</u> copy of that message
+ is in the specific directory/folder.
+
+ The <b>date:</b> prefix can be used to restrict the results to only messages
+ within a particular time range (based on the Date: header) with a range
+ syntax of:
+
+ date:<since>..<until>
+
+ See <b>DATE</b> <b>AND</b> <b>TIME</b> <b>SEARCH</b> below for details on the range expression, and
+ supported syntax for <since> and <until> date and time expressions.