How to pad OST file to prevent fragmentation

Does anyone have any clever tricks on how to quickly fill then empty an OST file, so you can get it to what your maximum mailbox size in, then clear out the padded space so it has a ton of free space in it, and the file will no longer become fragmented then.
We have performance issues once large OSTs get heavily fragmented due to them constantly expanding as more and more email builds up, so was wondering if there was a way to grow it or pad it to make it the max their actual mailbox could get, then free the
space from the garbage files.

Hi RJ022,
Yes, I agree with Daine that compacting a file just help to reduce only approx 20% of white spaces in the data file. But, if you really want to solve this large OST data issue, then you should prefer archiving
instead of this one. It will help you to make an archive of Outlook data file and reduce the risk of damaged data and slow Outlook interface.
For more about “Archive” option in MS-Outlook:
http://office.microsoft.com/en-in/outlook-help/archive-items-manually-HA010355564.aspx
Thanks
Clark Kent

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JonhLokson: You
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Use OST Open File Tool
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OST files are not a local backup, they are a cache of what is in the mailbox.
https://support.office.com/en-gb/article/Introduction-to-Outlook-Data-Files-pst-and-ost-6d4197ec-1304-4b81-a17d-66d4eef30b78#__toc290027730
Robert Pearman SBS MVP
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Actually it is not the right forum for this issue, but I’d like to share the following article with you, hope can help you.
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http://office.microsoft.com/en-in/outlook-help/repair-outlook-data-files-pst-and-ost-HA010354964.aspx
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Here is an old thread but a nice recap by Dr. Smoke
._Files
Note that the ._file files you note are the resource forks of Mac files you copied to the drive from your Mac, and these are only visible when you use the Flash drive on a PC. These are normal and indicate the Flash drive is already formatted for Windows.
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How to pad OST file to prevent fragmentation

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