"Find" capability in Outlook

[Keane]

The problem: From any mailbox directory you should be
able to do a basic "find" or an advanced "find" looking
for all the email with keywords in either the subject
line, in the body of the message, or in both. The
standard find and advanced find will successfully locate
mail messages with keywords in either the subject line,
body of the message, or both if the message
is "unsigned". But if the message is "signed" the basic
and advanced finds will not locate the messages if the
keywords are only in the body of the message and not in
the subject line. So, unsigned message finds work; signed
message finds do not work if the keywords are only in the
body and not in the subject line.

Have anyone encountered this problem and/or know a fix for
this problem?

Any help would be appreciated. Thank you.

Keane