Ehi Pascal, welcome aboard!
Did you have already read some Zentyal discussions? There are a lot of Zentyal experts around 
A few examples:
Moving from Zentyal to NethServer: questions about how to do a few things
Moving (?) from Zentyal to nethserver
Zentyal vs NethServer comparison matrix
Moved from Zentyal 4,1 to NethServer release 6.6 (Final) in hours!
eMail move from Zentyal to nethserver - newbie questions!
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