flags <strong>not</strong> in the given Flags object.
 Useful for clearing flags not supported by a server.  If the
 given Flags object includes the Flags.Flag.USER flag, all user
 flags in this Flags object are retained.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>f</code> - the flags to keep</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if this Flags object changed</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>JavaMail 1.6</dd>
</dl>
</li>
</