Mailbox and OST file

Posted on 2011-10-25
Last Modified: 2012-08-14
What are the differences between OST file and the Mailbox on Exchange server especially on size?
Question by:sis-tony
    LVL 3

    Expert Comment

    You should not match data size of OST and mailbox size in server. OST file is a local file of cache information only and not the actual size of mailbox. Real size of mailbox size is which is hosting on server.  Usually the file size will be bigger on exchange and this is normal.  You could try compacting it to help reduce it a bit.
    LVL 12

    Accepted Solution

    The OST or offline folder file is an offline cache of exchange data. The mailstore should be similar, however its database footprint on the exchange server will be larger. The mailbox size is represented fairly accurately but the database must be defrag'd to make it smaller after a period of time.

    Are you just looking for background information or do you have an issue?

    Author Comment

    I just looking for background information of that...
    LVL 3

    Expert Comment

    Hmm, not sure what exactly you're expecting to read then because I thought I answered your question.

    OST's are used in Exchange/Outlook cached mode. It is an Offine copy of what is stored on the server.

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