07-31-2018 05:22 AM
07-31-2018 05:42 AMSolution
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."
07-31-2018 06:20 AM