For example, you may use a laptop computer at your office and connect via a network cable to your corporate local area network (LAN).
You have access to headers and full items, including attachments.
You can continue to work uninterrupted with your data.
If the connection remains unavailable, Outlook switches to Disconnected, periodically checking for server availability.
Top of page When data is optimized for an Exchange connection type, the type of items that are synchronized with your server mailbox are different.
When the On Slow Connections Download Headers Only setting is selected, Outlook stops automatically downloading full items and also leaves attachments on the server.Later that day, you use a modem for dial-up access to your Exchange account.Outlook recognizes your connection is slow and automatically optimizes for that connection by downloading only headers and not updating the Offline Address Book.To change whether shared folders or Public Folders are downloaded when Cached Exchange Mode is turned on, do the following: Cached Exchange Mode enables a better experience when you use an Exchange account.When you are using Cached Exchange Mode, an email message may remain in the Outbox for up to one minute until the next synchronization with the server that runs Exchange occurs.If you want to send the message immediately, do the following: In addition to Exchange folders, Cached Exchange Mode works with shared folders.Examples of shared folders include another person's Exchange folders when you are using Delegate Access, or Share Point folders.In this mode, a copy of your mailbox is saved on your computer.This copy provides quick access to your data, and it is frequently updated with the server that runs Microsoft Exchange.If you have wireless access, Outlook could reestablish a connection to the server and switch back to Connected status.You aren't required to change any setting or restart Outlook.