Our installed version is Zimbra 6.

We have problems in searching mails by means of partial words using '*'
In both simple and advanced search.

Example:

searching "importan*"
return the email with subject:
"this is an importan subject"

searching "*portan*"
does not return the above email

searching "*portant"
does not return the above email

Is it a bug?
Can you support us?