http://wiki2.dovecot.org/Quota/Configuration says:

concat('*:bytes=', quota_limit_bytes) AS quota_rule and concat('*:bytes=', quota_limit_bytes) AS userdb_quota_rule

but a generic quota_rule on the same page says:

plugin { quota = maildir:User quota quota_rule = *:storage=1G quota_rule2 = Trash:storage=+100M }

Are "bytes=" and "storage=" equivalent?

http://wiki2.dovecot.org/UserDatabase/ExtraFields also shows "storage=":

user_query = SELECT home, uid, gid,
'*:storage=100M' as quota_rule, mail_plugins,
'gz' as plugin/zlib_save FROM users WHERE userid = '%u'

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