[horde] compatibility of database versions

[emacias@usb.ve]

Hello, Actually we're working with Horde 2.1.2 and IMP 3.2.2 and Turba  
1.2.1 and we'are probing versions Horde 3.1.3, IMP 4.1.3 and rest of  
importants modules for implement in litle days.

on /horde/scripts/upgrades directory there are scripts file for  
converting versions but there's not for converting versions horde  
2.1.2 to horde 3.1.3.

I see that horde_prefs has the same field in both versions. And then,  
I tried use  horde_prefs table version horde 2.1.2 in horde 3.1.3 but  
it's not saving preferences.

Whould you explain me, if i can work with tables version 2.1.2 in  
version 3.1.3?