Unable to see free / busy information across two different organizations
We have 2 organizations with Federation trust and have been sharing free / busy information successfully between the two organizations. A week ago, we had to move our Exchange server to a new location and changing our public IP address. Since we have made this change, the other organization is now unable to see free / busy information for our organization. I have checked everywhere and cannot see a reason why this would stop working. Looking for suggestions / guidance from the experts.