Managing .ost files

Posted on 2011-04-18
Last Modified: 2012-05-11
Recently, with the deployment of Exchange 2010, my users will be receiving much larger mailboxes. However, with bigger mailboxes comes much bigger .ost files. I’m noticing the .ost files are growing to even larger size limits than the users mailbox size; thus, my concern is how to manage these .ost files to preserve users local disk space.
Any advice?

im running a mixture of Outlook 2k3, 2k7, 2k10
Question by:DEFclub
    LVL 3

    Accepted Solution

    LVL 16

    Expert Comment

    OST files get fragmented over time, so they can grow due to white space.
    The "compact" action is like a defrag, but is a short term gain - unless  a large amount of mail has been moved elsewhere.

    Author Comment

    Any way to manage .ost files from a Group policy or Exchange standpoint?
    LVL 16

    Assisted Solution

    Not sure what you mean by "manage". OST files are a sync of the mailbox, so can be limited in size by the mailbox size limit.
    They may grow over this due to fragmentation, but the white space will be recycled.

    If Outlook performance gets really bad, then a "compact" may improve the client speed.

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