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Archive for March 14th, 2011

Outlook OST Size vs. Exchange Mailbox Size

Posted by William Diaz on March 14, 2011

You may (or may not) have noticed that the local cached mailbox for Outlook, also known as the OST file, is larger than the Exchange mailbox size. There is no shortage of misinformation about this topic, some of it incorrectly attributing this to corruption1. For example, the mailbox seen here in Exchange is only 132 MBs:
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