Exchange 2003 OWA ouf of office notification problem

Hello All.

I have a strange problem with the OWA out of office notification feature.

I enabled the option “I am out of office” in Outlook Web Access but when I sent an email to that account I do not get back an Out Of Office notification.

The strange thing that this occurs to some users while others report that the feature is working for them?

Any ideas what is the cause of this problem and can be repaired?

Thank you in advance.