Meeting request No Free Busy information

[MikeyB]

I have an issue where I am sending a meeting request from
my personal mailbox to several recipients.

One of these recipients when I click on attendee
availability is showing no information for Free busy
time. Everyone else is ok.

Now when I open the helpdesk mailbox (under administrator
account) and connect to my mailbox and bring up the
attendee availability for my meeting request all free
busy time is showing ok.

Can someone help me with getting all the free busy time
from my mailbox for this one person.

all mailboxs are on the same exchange server.

Thanks