Hi,

currently I am using 6.4.1-0 which I installed according to

Open-Xchange
http://wiki.open-xchange.com/wiki/index.php?title=Open_Xchange_Installation


What is the best way to upgrade to the latested 6.6 without loosing user information like calendar entries?

Can I use the pre-built apt packages?

Regards,
Markus