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We use courier imap for imap and pop connectivity. After a standard install you have to use 'mkimapdcert' and 'mkpop3dcert' to generate the SSL certificates. This will cause clients (such as outlook) to present the user with a window which says they cannot verify the authenticity of the certificate. There are two ways around this problem
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This section focuses on how to publish digital certificates into an ldap server. You need to publish digital certificates if you run a Certificaton Authority. Publishing to LDAP is a simple way to make this information available in the network .Also many certificate aware software uses LDAP as a preferred repository for user certificates.
A two-page diagram (fits on a sheet of paper when printed) which shows the possible subnet configurations of an IPv4 class C network. Very useful for planning and checking subnets as well as for teaching.
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When using iChat AV with NAT routers and firewalls, certain ports must be open to allow video and audio conferencing behind a firewall. Some devices have these ports open by default, while others require configuration.
RAID-1 (mirroring) is a popular approach to protect the system from a harddisk failure. It is either done in hardware or software. The usual hardware solution is to buy a RAID disk controller like the popular 3ware ATA RAID controllers and then not having to deal with any software incompatibilities because the system just sees one large physical disk.