[horde] imp and turba/favourites

[A. Schulze]

Hello,

we're using IMP and Turba as well as other horde application.

Some weeks ago we re-enabled the favourites address book.
We expect the address book fill with addresses used as recipients for  
message we write.
But the address book is always empty.

Are there any special configurations needed to let imp know it should  
report recipients to Turba?
How does that communication work at all? Which addresses I could  
expect as favourites?
Do we need to write 10 message per hour to one address to force this  
recipient is "favourite" ?
Does the addresses expire after some time?

Andreas