This article explains what PST files are, how to find and use them on your computer, and how to convert a PST file so that the emails can be used in another program.
How to Repair PST and OST File in Outlook 365
A file with the .PST extension is an Outlook Personal Information Store file that stores personal information used in Microsoft Outlook or Microsoft Exchange. This can include messages, contacts, attachments, addresses, and more.
This format imposes a file size limit of 2 GB. PST2GB can reduce the file size by trimming everything larger than 2 GB and creating a new PST file of the appropriate size.
PST files are typically opened in an email program that can use the data, such as Outlook (more on how to do that below) or Microsoft Exchange Server. Outlook Express can also import PST files, but it doesn't store information in a PST file like Outlook does.
