Prevention is always better than cure; there are many ways to prevent PST file corruption, but in the event of corruption actually affecting your PST file, there always is a rescue resort you can try, which is to perform corrupt PST repair process using a commercial software solution.

• Keep your inbox clean and healthy for quick and easy access * You must regularly clean up any unwanted mails from your inbox to keep your mailbox healthy and allows easy and quick access to any useful information, and prevent bulking of your PST file with unnecessary storage of any surplus data. Empty your deleted items folder on regular intervals. Also, keep deleting the old emails, which will no longer be of any use to you. Keeping such emails will only add to your PST file size which can cause oversizing of your Outlook PST file, and resultantly into corruption. To avoid such occurrence, it is always better to keep your mailbox clean.
  
  
• Avoid inappropriate downloads from Internet that can be accompanied with viruses * You must discourage yourself from downloading anything from unknown websites and opening any attachments that come along with emails from unknown senders * that might contain potentially harmful viruses associated with the data or emails. These viruses by and large consume your system resources and increase your CPU usage as well as eat up your bandwidth.  Some viruses even might affect your Outlook PST file which will yield you some, if not many, Outlook errors.
  
  
• Use proper UPS to deal with inadvertent power failures or fluctuations in power supply * Inadvertent power failures and voltage fluctuations cause disruption of system routines and might lead to alterations in registry files, and sometimes may even lead to Outlook PST corruption. To avoid such, you must ensure proper backup UPS and appropriate sources of power supply to keep your computer healthy and to avoid any corruption of PST file.
  
  
• Keep regular backups of useful mailbox data * Keeping a regular backup of your useful email data is a healthy practice as prevention is better than cure. So, as a precautionary measure, you must possess a backup of any and all of your useful data in any form.
  
  
• Corrupt PST repair * In case even after the above precautions, you happen to have a corrupt Outlook PST, you need a third-party PST repair solution; a recommended one is Outlook Recovery which is best suited for corrupt PST repair process and can recover PST data from any degree of corruption. It has a powerful GUI which is self-directing and you need not to seek any expert help. But even if you do, you can entrust the vendor of Outlook Recovery 64 bit tool. If you don't, then there is an option for your to explore the tool by using the free version of this tool.