PST file compression ratio

U

U0pNUA

#1
Does anyone know how much a pst compresses data when exporting a exchange

mailbox to .pst file?

Or a tool which would tell you the size of a .pst file if not compressed/ or

exported to an exchange mailbox?

Thanks

SJMP
 
R

Roady [MVP]

#2
That completely depends on the contents on the mailbox and moreover; the

file formats of the attachments.

On average an ost-file is about 25-30% larger than the size of the reported

size of the server mailbox in Outlook. As ost-files and pst-files compare

pretty much 1:1, that is what you can expect in size.

Note that importing pst-files back into Exchange will never give you back

the efficiency of Exchange as single instance storage will no longer apply.

---
"SJMP" <SJMP> wrote in message

news:634A952E-EDBD-4D51-A181-9EF07A8F5170@microsoft.com...
> Does anyone know how much a pst compresses data when exporting a exchange
> mailbox to .pst file?

> Or a tool which would tell you the size of a .pst file if not compressed/
> or
> exported to an exchange mailbox?

> Thanks
> SJMP
 
Outlook version
Outlook 2016 for Mac
Email Account
Office 365 Exchange
#3
How much compression you achieve will depend not only the on the archive type you create, but on the application you use to compress it and the settings you use. If you want to compress something to use as little space as possible, you should definitely use 7z. You can even crank up the compression settings to save even more space, although it will take longer to compress and decompress. Most compression tools have settings to allow you to achieve a higher compression rate at a compromise of slower compression/decompression times and more RAM usage.
 

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