If Outlook is stuck in Offline mode, see Work offline in Outlook. 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.
We recommend always using Cached Exchange Mode with an Office account. Exit, and then restart Outlook. By default, when Cached Exchange Mode is turned on, a local copy of shared folders is downloaded to your computer. To change whether shared folders or Public Folders are downloaded when Cached Exchange Mode is turned on, do the following: If the Cached Exchange Mode option is missing, one or more of the following might apply: For more information, contact your Exchange administrator.
Cached Exchange Mode is the default when you add an Exchange account. Click Account Settings, and then click Account Settings.
On the E-mail tab, click the Exchange account, and then click Change. Exit and then restart Microsoft Outlook 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: Top of page Manually configure message download preferences Cached Exchange Mode can automatically optimize data transmissions for the connection speed to the server that runs Exchange.
However, you can manually change the download preferences. Click one of the following options: All messages and attachments are downloaded. When downloading a large amount of items, this setting is useful so you can see message headers quickly and then choose a message to open without first waiting for all messages to be downloaded in their entirety. This reduces the data transfer amount and connection time. When you open an item, the full item is then downloaded from the mail server.
If this option is not selected, the three previous choices determine what is downloaded regardless of the connection speed. 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 SharePoint folders. To turn on or off shared folder support when you are using Cached Exchange Mode, do the following: Click the File tab.
On the Advanced tab, under Cached Exchange Mode Settings, select the check boxes for the options you want. Top of page Why isn't the Cached Exchange Mode option available? If you are unable to turn on Cached Exchange Mode, one or more of the following might apply: Top of page Cached Exchange Mode provides you with a better experience when you use a Microsoft Exchange account.
A copy of your mailbox is stored on your computer. This copy provides quick access to your data and is frequently updated with the mail server. Most home and personal accounts do not use Microsoft Exchange.
About Cached Exchange Mode If you work offline, whether by choice or due to a connection problem, your data is still available to you instantly wherever you are. If a connection from your computer to the server running Exchange isn't available, Microsoft Office Outlook switches to Trying to connect or Disconnected. If the connection is restored, Microsoft Office Outlook automatically switches back to Connected or Connected Headers.
Any changes you make while a connection to the server isn't available are synchronized automatically when a connection is available. You can continue to work while changes are synchronized. How data is optimized When data is optimized for an Exchange connection type, the type of items that are synchronized with your server mailbox are different. For example, when you use a fast connection, Office Outlook copies the header, body, and attachments of an email item from the email server to your computer.
When a slower connection is selected, only headers are automatically downloaded. The body and any associated attachments are downloaded only when requested by you, or as necessary for synchronization with personal digital assistants PDAs , auto archiving, and some client-side rules.
In a slower connection environment, the Offline Address Book is also not automatically updated. However, you do have the option of manually requesting the update. Downloading headers only is a feature available when you connect to Exchange Server or Office Outlook Adjusting the amount of data sent over the connection Cached Exchange Mode takes advantage of the ability of Outlook to automatically determine the speed of your connection to Exchange, and it optimizes data transmissions for that speed.
When the On Slow Connections Download Headers Only setting is selected, Outlook stops automatically downloading full items and also leaves attachments on the server. 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 have quick access to the server running Exchange. You can continue to work uninterrupted with your data. If the connection remains unavailable, Outlook switches to Disconnected, periodically checking for server availability. 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. 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. Additional optimizations are also made to reduce the amount of data sent over the connection. By offering different levels of optimization, Outlook can adapt to changing connection environments, such as disconnecting from a corporate LAN, going offline, and then reestablishing a connection to the server via a slower dial-up connection.
Downloading headers only is a feature available when you connect to Exchange or later. Automatic versus manual connection behavior selection You always have the option to manually set the connection behavior. In some cases, you may want to control your connection behavior and the amount of data transmitted to and from Exchange. At the office, when connected to a high-speed local area network LAN , Download Full Items is probably the best option.
If you connect via a service that charges by the amount of data you send and receive, which is common with cellular and GPRS connections, select Download Headers. The amount of data sent over the connection is reduced and your connection time shortened.
You can then request only the full items you need. Downloading headers only is a feature available when you connect to Exchange or Exchange