free/busy can't see in schedule tab

I followed the procedure below but I can't, even when I publish it locally and add it to a contact to test it, see the free/busy items.
Publishing the vbf goes very nicely, no issue there. But how to make this information accessable to others.
Any suggestions?
Stefan

How to set the free/busy search path for a specific contact
1. In the navigation pane, click Contacts, and then double-click an entry to open a contact.
2. Click the Details tab.
3. Under the text that reads Internet Free-Busy, type the fully qualified path of the location that you want to search for this Contact's free/busy information in the Address box. You can use any valid URL format, such as: http://..., file://\\..., or ftp://....

The following is an example of a valid format:
ftp://Contactserver/Freebusy/Contactname.vfb
Internet free/busy information appears on the Scheduling tab of appointments and meetings.