2.1 to 2.2.31 on new server?

[Peter]

> Am 12.08.2017 um 10:57 schrieb voytek at sbt.net.au:
>> I have a Centos 6 server with Dovecot 2.1.17/mysql/virtual domains
>>
>> I'm setting a new Centos 7 server, and, aim to install 2.2.31 from
>> Ghetoforge
>>
>> dumb question, can I install 2.3 on new server, then, copy old
>> /etc/dovecot tree to new /etc/dovecot ?
>>
>> appreciate any tips and advice,

There are some changes in the config file format, see:

https://wiki2.dovecot.org/Upgrading/2.2


Peter