What is ost file? Generally, when you are connected with Microsoft Exchange Server account, all of your mail items such as emails, calendars, tasks, and other items are received and saved on the server. You can create and keep a local copy of it on your system by configuring Outlook. This file when created is named as .ost file known as offline Outlook Data File. It allows you to work offline when your connection to Exchange Server is interrupted. The OST file so created is synchronized with the Exchange server when the connection is re-established. How OST file becomes inaccessible? When an ost file is created, an encryption key is generated which binds the file with the profile for which it is made. This encryption key protects OST files from being accessed by other profiles. So, if in any case profile to which the ost file belongs, is deleted then, the user will not be able to access the ost file. This will make the OST file orphan. And when you will try to open an o...
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