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Mozilla filter to sieve converter is a html/javascript form that can take a copy and pasted set of Thunderbird/Seamonkey filter rules from a msgFilterRules.dat file and return the rules converted into sieve rules suitable for uploading to an imap server supporting the sieve filtering language.

(This version is an enhanced version of the converter provided by Boris Folgmann which was in turn based on Oleg Rekutin's converter)

To start converting your filters visit http://mozfilter2sieve.sourceforge.net/mailfilters.html.

The output formatting of the sieve is designed to be fully compatible with the formatting used by the roundcube plugin sieverules.