SIMS supports internationalized string searches in mail messages using any major character set. Search strings are no longer limited to ASCII/English.
Some mail clients, however, perform searches locally. That is, they use client code to perform searches. This client code may or may not support an internationalized search. To do an internationalized search using the SIMS search code, mail clients must send an IMAP SEARCH command to the server.
If a mail user cannot do an internationalized search, make sure that the mail client used sends an IMAP SEARCH command to the server.