initial faq

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+# Frequently Asked Questions
+
+[[!toc levels=2]]
+
+## How come this query matches mails in folder:2013? `notmuch search --output=files folder:inbox`
+
+You have duplicates of the message in both folders.
+
+Notmuch searches are message based. Multiple files may be associated
+with the same message (i.e. the files have identical Message-ID). A
+folder: search will match the folder of any of the files. The
+--output=files option outputs all the files of all matching messages.