Outlook 2007 Advanced Find options greyed ou

[gerryR]

Hi All

For some reason in Outlook when I go to the advanced find to search for
mails from a specific date with a specific subject all the advanced options

From Body Subject To
Add Criteria

are greyed out, it is prompting me to click here to inable instant search
but we have alot of users and don't want to go installing windows desktop
search on peoples machines. Surely our users can run the advanced find
without installing this?

Thanks in advance for any help!
Gerry