Invitations from Outlook 2000

Hi,

we have a user with Zimbra running for a part of his users. The rest still use Outlook with a POP server. The bad thing is, that they use mostly Outlook 2000.
When some Outlook User sends an invitation to a Zimbra user, he only sees the email but does not get the buttons to acctep the invitation.

It seems that the format for the invitation is not understood. It attaches a winmail.dat file instead of the vcalendar from Outlook 2003.

Any chance to get this working?


Thanks Christian