[horde] Need help to merge 4 seperate horde installs

[netty 2006]

Hello,

We have 4 seperate horde 3.1.1 installs on seperate servers.
Now we wish to run a seperate horde server that serve users of all 4 installs.
Here i need help on merging user preferences, address books, memos,
etc for all 4 installs into one.

I tried to lookup but couldnt find an adequate anwer anywhere.
Can someone guide me how should i go for this merge?

Another problem i have is duplicates in a few installs.
Like someuser at domain.com may exist in 2 installs, so it may create an
issue in merging them.

As i see there isnt a straight way, but even if someone can guide, it
will help a lot.
Even if it needs scripting or data transformation of some sort.

Regards,
Netty