By default when you connect an Exchange mailbox to Outlook 2007 or Outlook 2010 the ‘Use Cached Exchange Mode’ option is enabled.The Outlook cached mode feature was designed to reduce network traffic between the Outlook clients and the Exchange server.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.
The following registry settings can be used to disable the Global Address List from being included in the cache.
It also creates a faster response time of the Outlook client (especially when opening large attachments) and gives the ability to work offline.
It does this by creating a local copy of the mailbox and synchronising the updates as needed.
To turn on or off shared folder support when you are using Cached Exchange Mode, do the following: Cached Exchange Mode provides you with a better experience when you use a Microsoft Exchange account. This copy provides quick access to your data and is frequently updated with the mail server.
If you work offline, whether by choice or due to a connection problem, your data is still available to you instantly wherever you are.
For users who connect to Microsoft Exchange server, maintaining a contacts folder in the Public Folders hierarchy is one way to benefit from a group address book that individual users can contribute to.