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

Battleship movie part 1. 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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Office 365 (Outlook for Windows) - How to locate, move, or back up your personal folders (.pst) file

This document will guide you through the steps needed to reconnect your local .pst file to your UW-Madison Office 365 Outlook profile.

Note: For details on .pst/.ost files, review Office 365 (Outlook for Windows/MacOS) - Data files documentation.

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Important: By February 28, 2017, Office 2013 version Office 365 ProPlus is no longer available for installation with an Office 365 subscription. Microsoft will no longer push any updates to Office 2013 suite of applications - complete details.

How to identify the name and location of your personal folders file

Microsoft Outlook for Windows

1. Start Outlook.
2. Click the File tab in the Ribbon, and then click the Info tab on the menu.
3. Click the Account Settings tab.
4. Click Account Settings again.
5. Click Data Files.

   Checking the default locations in addition to verifying the existing location is always recommended as there might be some disconnected pst-files which you might have forgotten about but still like to keep anyway. The default locations to check are:

   • C:Users%username%AppDataLocalMicrosoftOutlook
   • C:Users%username%DocumentsOutlook Files

   You may have more than one .pst file you are using. Note the path and file name of each of these files. The name of any .pst file (other than the default - Outlook.pst) will be the same name within your folder structure.

6. Click Close, click OK, and then click Exit and Log Off on the File menu to quit Outlook.

How to backup/copy your personal folders file (.pst)

Caution - the Office 365 support team does not recommend storing data locally for the following reasons:

• Security - if someone gets access to your computer, they can easily extract the data from the local data file.
• Loss of data - if the data is not backed up, it cannot be recovered.
• Deleted data - if deleted, Microsoft's recovery tool cannot be used to restore the data.

If you found a local pst file, use the instructions below to backup/copy. If you do not have one and want to create one, follow these instructions: create an Outlook data file. After you have created a local pst folder, you will need to manually move/copy items into it. If you use the move command, it will remove the item from within your Office 365 account and place it within your local folder. This means it will no longer be visible in Outlook on the web and can only be accessed from the computer where you have this local file configured.

1. On the Start menu, point to Programs, and then click Windows Explorer.
2. Browse through the files to the location of your .pst file (from above).
3. Copy your .pst file to the location that you want.

How to point Outlook to your new personal folders file

Important: If you have reconfigured Outlook with a new proflle, use the steps below to connect your pst file to this profile.

Microsoft Outlook for Windows

1. Click the File tab.
2. Click Open and Export
3. Click Open Outlook Data File.
4. Search and find the .pst file you want to connect, and then click OK.
5. On the File menu, click Exit.
6. Restart Outlook.

See Also: