[CentOS] Upgrade mail server to new machine

[John R Pierce]

Tom Brown wrote:
>> Is there an easy way to copy all the user accounts and existing mail
>> from the old server to the new one?
>>   
> if local users copy /home/* /etc/passwd /etc/shadow after first making 
> sure there are no dupes on new system
>

I usually do this with yank/paste in vi or whatever, just 
cutting/copying the user entries, and leaving the standard accounts on 
the new system alone.   of course, be sure to copy the exact same 
entries into /etc/shadow!