However, perhaps the most significance difference between the two is the accessibility. There are other differences between PST and OST files, but you can consider OST files as simply offline copies of PST files. It is saved on your computer and these files contain data from your most recent messages and other data from Outlook such as contacts, tasks, calendar info, and more.

While PST files are the data from Outlook that can be accessed when you have internet, OST files does not require you to have internet. OST files are short for Online Outlook Data Files, which is often mistaken as the Outlook Data File that is referred to as PST files. What are OST Files? What are 9 Best OST Viewers and Their Cons & Pros? Bottom Line What are OST Files? But before we get deeper into this subject, do you have an idea of what OST means? There’s also the problem with filtering the ones that are affordable from the expensive ones.įortunately, many users have had the same thought as you had, and that’s why a lot of experts decided to compile the best OST viewer out there. To begin with, there are different factors that can determine the “best”. Nowadays, finding the best OST viewer can be very hard and time-consuming, especially if you don’t have any idea where to start looking.

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