When this option is enabled, Outlook only downloads the information needed to show messages in the message list, and not the full content of each message.
When you click on a message, the rest of the message is downloaded for viewing.
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Follow these steps to compact the local cache file: NOTE: Outlook Connector includes the option “Download Headers Only” under the Send/Receive tab of the Outlook Connector Client configuration screen.
Then I went to Microsoft’s own “What’s new in Outlook 2013 Preview” page, where I discovered the same comment about new OST files being 40% smaller.
But then I read all about “By default, if Cached Exchange Mode is enabled, Outlook 2013 Preview will only cache email messages from the last 12 months and remove anything older than 12 months from the local cache.
For instance, I see several new emails in my mailbox when I login to webmail which I don’t see in Outlook.
Also, it looks like the entire month of June has gone missing in Outlook but the emails are luckily still available on the server.