I have done a reinstall after a crash and have a problem in that when the clients try to access email using Outlook Express (Email is IMAP rather than POP) that I get an error "Can't initialize .uidvalidity file".
If I try to access webmail, all the folders are empty.
After the fresh install of SME Server 5.6 with update 4 I did an rsync of files backed up using backup2ws of the following:
/home/e-smith
/home/netlogon
/etc/e-smith/templates-custom
/etc/e-smith/templates-user-custom
/etc/group
/etc/gshadow
/etc/passwd
/etc/shadow
/etc/smbpasswd
/etc/ssh
/opt