[horde] Upgrade from H5 to H6

[Brent]

  Quoting Andreas Mauser <andreas at mauser.info>:

> Dear Team,
>
> is it today possible to upgrade a H5 to a H6 without new install?
>
> Best,
>
> Andreas, and a happy new year!
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The way I did it was to install the new H6 bits into a new directory.  
I use a mysql database; so, I then configure the new H6 installation  
to use the existing mysql and upon first admin access, it'll prompt to  
update the db schema. Seems to run fine after that for me. I would  
highly suggest making a backup of the database in case something  
doesn't go right. One then needs to repoint the webserver to the new  
root dir and you should be set. Addresses, contacts, notes, and such  
are all retained for each user, in my experience.

I would suggest testing this on a parallel installation, if possible.

brent