Microsoft Office Tutorials and References
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Exchange Online Archiving mailbox
Exchange Online Archiving mailbox
EOA is a new enterprise cloud-based archiving solution. It is designed to hold large
amounts of data, to the point that if needed, there is an option for you to provision an
unlimited amount of EOA storage for your organization.
EOA should be viewed as a solution to replace Personal Storage Table (PST) files. The .pst
files have been around for a long time and have been a popular choice for archiving old
emails. Over time, because .pst files have size limits, users have resorted to creating multiple
.pst files to overcome these size limits. Multiple .pst files are then mounted in Outlook to
access the contents. This approach allows users to have all their emails and the ability to
drag and drop emails between the multiple .pst file locations and the primary mailbox.
However, .pst files have been seen as a major organization problem for the following
The .pst files are local file-based storage and, despite the ability to password protect
.pst files, they are a high risk for data loss.
The .pst files cannot be easily searched from a central location if there is a need for
electronic discovery.
Legal holds cannot be placed on contents stored in .pst files.
Records retention and management policies cannot be easily applied to contents
stored in .pst files.
For users, there are inherent shortcomings as well. In today's world where it is likely that
each person owns and uses more than one computing device, the localized nature of .pst
files makes it difficult to synchronize the contents across multiple devices. The rise of
mobility further limits the user because access to .pst contents is not possible through mobile
solutions such as OWA.
EOA resolves both the requirement for organization compliance as well as the access
challenges faced by users. EOA is also a consideration for organizations that have deployed
third-party archiving solutions.
As an added benefit, EOA is available for Exchange Online and Exchange on-premises. We
will examine these two configurations in Chapter 11. We provide a more detailed look at
the features of EOA in the "Exchange Online Archiving" section later in this chapter.
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