The use of Outlook's PST data files have the
potential to cause serious problems from data loss to compliance issues.
PST
files are Outlook data files that are sometimes used as a mechanism for
message archiving or for avoiding mailbox quotas. Although PST files
can be handy, it is best to avoid using them in your organization if
possible. Here are ten reasons why.
1. PST files are rarely backed up
PST
files typically reside on workstation hard drives or on removable
storage devices. In any case, the PST file is unlikely to be backed up
because most administrators do not backup workstation hard drives. This
of course can lead to data loss.
2. There may be compliance issues
Every
organization has sensitive data that they do not want leaked to the
public. Sometimes this data is company confidential, and in other cases
there may be regulatory issues describing the proper handling of the
data. In either case, the use of PST files makes it far too easy for
sensitive data to walk out the door.
3. PST files are prone to corruption
One
of the big problems with PST files is that they are prone to
corruption. The original PST file format had a 2 GB size limit, and
corruption would occur if the file grew beyond its limit. Modern PST
files are less prone to corruption, but can still be problematic. This
is especially true for PST files that are stored in locations where they
might be accessed by more than one user at a time.
4. They make e-discovery more difficult
Data
that is stored in a PST file exists outside of the Exchange information
store. As such, PST data is not analyzed when you use the native
Exchange Server e-discovery tools. There are third-party e-discovery
tools available that can analyze PST files (assuming that the tools have
access to the files), but there is no question that the use of PSTs
complicates the e-discovery process.
5. Network-connected PSTs are not supported
It
was previously stated that PST usage can be problematic due to the fact
that PSTs are often stored on workstation hard drives or removable
media, and therefore do not tend to be backed up. Unfortunately however,
Microsoft does not support storing active PST files on network shares.
Placing an active PST file on a network share increases the odds that
the file will become corrupted (at least that’s what Microsoft has
always preached).
6. PST files are local to a device
Today
it is common for users to access mailbox data from a variety of
devices. They might access their mail from a PC while working at the
office and from a smartphone while on the go. However, PST files are
device specific. If Outlook stores data in PST files then the data will
only be accessible using that copy of Outlook. The data will not be
accessible to any other device that accesses the corresponding mailbox.
7. PST files only work with Outlook
Another
disadvantage to using PST files is that they only work with Outlook.
Mobile devices that attach to Exchange mailboxes using ActiveSync cannot
open PST files. Similarly, Outlook Web App does not include any support
for PST files.
8. PST files can be used to circumvent message lifecycle management policies
Some
organizations put policies into place to regulate message lifecycles.
For instance, an organization might automatically purge messages of a
certain age. The idea is that once a message is old enough that the
organization is no longer required by law to keep a copy then the
outdated messages can be purged to keep them from being subpoenaed in
the event of litigation. If a user stores old messages in a PST file
then they have effectively circumvented the message lifecycle management
policies. Doing so may eventually put the organization at risk in the
event that the messages are ever subpoenaed.
9. Shared PSTs are problematic
I
mentioned earlier that PST files were sometimes prone to corruption.
One thing that is known to greatly increase the chances of a PST file
becoming corrupt is sharing a PST file among multiple users. This is
especially true if two users simultaneously attempt to open the same PST
file.
10. PST files increase the cost of doing business
PST
files have a tendency to increase the administrative burden.
Administrators might be asked to discover PST files across the
organization, or a user might ask an administrator to try to recover
data from a corrupt PST file. In either case, there is a cost associated
with the extra administrative effort. Likewise, there might be costs
associated with data loss or inappropriate data exposure.
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