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Important: When using Outlook with an Office 365 mailbox, we recommend always using Cached Exchange Mode.
In this mode, a copy of your mailbox is saved on your computer.
It is possible to have different setting for each folder in an account, so, for example, you could set Outlook to download only headers in a folder that you know gets a large volume of e-mails.
Use Cached Exchange Mode to work with items in your Office 365 or Microsoft Exchange Server mailbox even when your network connection is slow or unavailable.
Sometimes it is to your advantage to not download an entire e-mail from your mail server, such as when you have a slow Internet connection or you want to start looking through many e-mail messages for a particular one as soon as possible.
Outlook offers the capability to download only the e-mail header, which includes the sender and the subject of the e-mail, and display these onscreen before downloading the message itself. To configure Outlook to download only the e-mail headers, do the following: 1.