How to Compress PST File Used by Microsoft Office Outlook – Microsoft Outlook is a very popular program from Microsoft office and it is used as Personal Information manager worldwide. It can also be used in collaboration with Microsoft exchange server and Microsoft share-point server. MS outlook stored its data in PST (personal folder file).

Over time PST file becomes very large and after years of usage, it becomes huge. Huge PST file starts to develop many more complications despite the robust file format. These complications are as follows:

1. Slow performance of Microsoft outlook as it needs to parse huge PST file.
2. Chances of becoming corrupt due to many reasons which can be a small disk failure or use of any malfunctioning software or virus.
Now you must have understood that there an urgent need to compress the size of Microsoft Outlook PST file as critical emails and other information is stored in it and lose of data is painful as it costs a lot of money and time. Slow performance has a very low weight-age as compare to the previous issue but still, it exists.
Now we come to the point as to how to reduce the size of PST file. As all, we know that most e-mail’s size usually has 80% data as attachments rest 20% is email content. Now we can hit this portion.

There are two methodologies by which we can compress the size of huge PST file.
1. Activate the compression scheme built in MS Outlook. This is very useful in general and easy to deploy but for that, one must have some knowledge of the internals of PST file or MS Outlook. If you want to know how then go Microsoft knowledgebase and check it alternatively you can find information here. But this might be not as helpful as all attachments will remain inside of PST file.
2. Another process seems more tedious and messy but this will help you most to reduce the size. This include optionally process of the first methodology then open your Microsoft Outlook and manually remove all your attachments from emails to a separate folder to your disk and remove them from your mails. You have to do this for all your emails and all objects of Microsoft Outlook where attachments can be embedded. Alternatively, you can remove them compress them by using zip software and then re-attach them. After completing this process again perform the first method.
The second method is more effective and useful as it can reduce the size of your PST file up to 80% and by combining both methods you can reduce the size up to 90%. It sounds impossible but it is.
Compress is a unique tool to compress PST files in a fast and efficient manner. PST compress is an award-winning and most widely used software for the purpose of shrinking.

John Abrams a Microsoft Office expert has been working in the technology industry from the last 7 year. As a technical expert, he has written technical blogs, white papers, and reviews for many websites such as