Differences between OUTLOOK PST files and OST files
Source: Internet
Author: User
PST file--Personal Folders file
One or more. pst files can be located on each user's computer. defined as primary or secondary storage. pst. Primary storage means that messages are delivered to the Inbox in the file and all other default Outlook folders, such as calendars, contacts, Deleteditems, journals, notes, sent messages, and reside on tasks. A. pst file is also defined as secondary storage, meaning that you can move messages to the file to receive box, manually or from your primary storage.
Each. pst file can contain 65,535 top-level items, maximum and maximum of 65,535 items per folder. Items are either folders, messages, tasks, and so on. When you reach the 16,384 item, you are upgraded to a large table format, which increases to 65,535 limits from 16,384. However, the. pst total file size cannot exceed two gigabytes (GB).
OST file--offline storage file
Use to save local copies of Exchange Server mailboxes on the local computer and synchronize items in the OST file with the server when the connection is available.
Only one OST file can be located on each user's computer. OST is always defined as the primary store, meaning that the message has been delivered to the Inbox, and that the file and all your other default Outlook folders, such as calendars, contacts, Deleteditems, journals, notes, Sent Items, and tasks reside.
The PST differs from the OST in that the contents of the OST can reside in the user's mailbox on the server. You can synchronize OST and mailbox folders so that they always contain the same information. This allows you to reconnect to the server when the server is not available offline, when the changes are offline, and then to upload to the server and mail download to the OST offline.
The total file size of the PST and OST cannot exceed 2GB.
Pst.ost can be compressed, modify the size of operations.
The OST PST is convertible, and the conversion tool is advanced Exchange Recovery
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