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Rising Flight's avatar
Rising Flight
Brass Contributor
Jul 31, 2018
Solved

OST File Size

Hi experts  i have 5 users and from the server side can i find out their OST file size.
admin
exchange
office 365
On-Premises
  • JeremyMiller's avatar
    JeremyMiller
    Jul 31, 2018

    I don't know that you can find the exact OST size from the server side, but you may be able to estimate it.  According to Microsoft documentation:

    "When you use Cached Exchange Mode, be aware that users' local .ost files are 50 percent to 80 percent larger than the mailbox size reported in Exchange Server. The format that Outlook uses to store data locally for Cached Exchange Mode is less space-efficient than the server data file format."

     

     

JeremyMiller's avatar
JeremyMiller
MVP
Jul 31, 2018

I don't know that you can find the exact OST size from the server side, but you may be able to estimate it.  According to Microsoft documentation:

"When you use Cached Exchange Mode, be aware that users' local .ost files are 50 percent to 80 percent larger than the mailbox size reported in Exchange Server. The format that Outlook uses to store data locally for Cached Exchange Mode is less space-efficient than the server data file format."

 

 

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