The short answer is never, but individual proprietors, consultants, can often revert to "personal" email accounts. The smart ones will set-up a secondary account that reflects their business or business name (virtually all service providers, i.e. folks like Verizon, Comcast, etc. include the ability to create several email accounts at no additional charge).
Barracuda's ArchiveOne product has been available for many years, giving organizations ownership and control over their email and file data, and allowing them to manage this information in‑place wherever it exists across the organization.
ArchiveOne has evolved continuously since the first version was introduced over ten years ago by C2C Systems, and following the recent acquisition of C2C by Barracuda Networks it has become the latest member of the Barracuda product family. It provides a comprehensive integrated Information Management solution that includes regulatory compliance and data retention as well as capacity management and eDiscovery.
The powerful policy-based approach used by ArchiveOne means that it can locate, discover and search unstructured data such as email in-place wherever it happens to be stored across the business. For instance, this can be in live mailboxes, in network locations or archives, or even in individual end user PST files, and unlike some other solutions there is no need to archive data first before it can be searched.