Fail-over friends keep Exchange chugging
Five disaster-proofers take different tacks to mail server protection
The degree of automatic protection and impact on the end-user also varies widely. DigiVault requires taking the mail store offline to restore it, and in the event of hardware failure, it requires a complete re-install. It’s intended to protect against data loss, not outages, and it does this well. MailShadow requires admins to initiate a manual switch-over for affected users and requires users to restart Outlook. Quest has automated switch-over for affected users, although Outlook will have to be restarted. Both Neverfail and SteelEye provide automatic fail-over for a whole server, and SteelEye provides additional many-to-one functionality at a lower price.
The best fit for you will depend on the percentage of your user accounts that need to be protected, how many Exchange servers you have to protect, how much you care about having to install an agent on the Exchange server, and whether you regard database corruption as a major threat. Although database corruption is not likely, the process to recover from it can be so terrible that it’s worth additional protective measures, either through a CDP product such as DigiVault or via the transaction-based replication MailShadow and Quest provide.