[horde] Sync does not delete on Horde side

[Andreas Mauser]

Dear List,

I had contacts in Horde, and contacts in Outlook. Some of them are the 
same.
I used Funambod Client to sync and they all synced both sides. The 
contacts from Hords gone to Outlook and vice versa.

The problem:
When I delete contacts in outlook and sync they are not deleted in Horde.

Can I fix this behaviour?

Kind regards and thank you,
Andreas