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I have a user who's OST file is about 47GB. But her mailbox is 4.5GB. And yes, she has already hit the 50GB limit. Why is the OST file so bloated? I have deleted her outlook profile and the ost file, then let it re-sync, but it still grows back to ~47GB! Couldn't find any large folders after searching, already emptied her deleted items. Tried turning off cache mode.. No help.

Only thing I have not done yet is compacting. Will compacting really get rid of 40GB of empty space? And from what I read, it takes hours & hours to complete? @47GB Probably needs to be a Friday night project then.

I know this problem is all over the web but I have tried just about everything I found. Hoping someone has another suggestion. Thanks!

Outlook 2010, Win7 / Exchange 2010

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  • If she access through Outlook to multiple shared mailboxes, than they are all stored in her OST. Try removing those mailboxes.
    – EliadTech
    Apr 2, 2015 at 8:09
  • There are no shared mailboxes Apr 2, 2015 at 14:32

1 Answer 1

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Figured it out... Unchecked the "Download shared folders" under the Cached Exchange Mode Settings. Not it sits at 6GB.

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