Horde to RoundCube Webmail Migration
Address Book
Export Contacts from Horde (vcard)
Expand Organizing
Click on Address Book
Click on the new icon in the upper horizontal navigation bar Import/Export
In the lower section of the page called "Export Address Book" choose vcard and confirm by pushing the button "Export"
- Save the file
Import Contacts to RoundCube
Click on Address Book
Click on Import contacts
Choose the vcard file of step 5. from above
Migrate Horde filters
RoundCube webmail is not yet configured for any client side filtering.