For Office or other hosted Exchange customers, the answer is easy — use cached mode. The Exchange CAS server is not local to you, so you will have higher latency and cached mode will accommodate this. With Office in particular, Microsoft will not prevent you from using online mode, but if performance is poor and you call support, they will instruct you to use cached mode. For the rest of you, consider the following — if you do any of these, online mode may provide the better experience for your users:.
Ultimately, I tell all my customers to use cached mode, and if they cannot for any reason, to use OWA instead of Outlook. Email open you up to threats. See how you can protect yourself against malware and time-wasting spam.
Cached versus Online mode — which one is better for you? Casper Manes on November 1, What is Cached Mode? How is Online Mode different? Watch out for latency issues Latency is really the most significant thing to consider when deciding between cached an online mode. Which one should I choose? Get your free day trial Email open you up to threats.
With Cached Exchange Mode, which is the default setting for users, Outlook no longer depends on continuous network connectivity for access to user information. When a user is connected, Outlook continuously updates users' mailboxes so that the mailboxes are kept up to date. If a user disconnects from the network, for example, by moving to an area without Wi-Fi access, the user can continue to access the last available email data.
Online Mode works by using information directly from the server, and, as the name implies, it requires a connection. Mailbox data is only cached in memory and never written to disk. Cached Exchange Mode is the preferred configuration in Outlook and is useful in the following situations:. Even when it is configured in Cached Exchange Mode, Outlook must contact the server directly to do certain operations. These operations won't function when Outlook is not connected and can take longer to complete on high-latency connections.
These operations include the following:. Delayed delivery options are client side in cached mode and server side in online mode. So, when you use Cached Exchange Mode, Outlook must be connected and open at the assigned delivery time for the delayed delivery message to be sent. At setup, the user can decide to enable Cached Exchange Mode. In some cases, you can improve the performance of Cached Exchange Mode for your whole organization or for a group of users—for example, users who work remotely.
When you use Cached Exchange Mode, be aware that users' local. The format that Outlook uses to store data locally for Cached Exchange Mode is less space-efficient than the server data file format.
The maximum size for. The default is 50 GB of data storage. Make sure that users'. When upgrading, if you do not change Cached Exchange Mode settings, the same settings are kept for Outlook However, by default, when Outlook is installed and Cached Exchange Mode is enabled, a new compressed version of the Outlook data file. The earlier version of the.
If you must keep Outlook from creating a new compressed Outlook data file. Most users find that Cached Exchange Mode performs faster than online mode. However, several factors can influence a user's perception of Cached Exchange Mode performance, like hard disk size and speed, CPU speed,. For troubleshooting tips about diagnosing and addressing performance issues in Outlook, see How to troubleshoot performance issues in Outlook. By default, when Cached Exchange Mode is enabled, shared mail and nonmail folders that users access in other mailboxes are downloaded and cached in the user's local.
Similarly, if a manager delegates access to his or her Inbox to a team member, when the team member accesses the folder, Outlook also starts caching the Inbox folder locally. You can disable caching of all shared folders for profiles that have Cached Exchange Mode enabled.
This setting applies to both mail and nonmail folders in Outlook If you want to disable caching of shared mail folders like a delegated Inbox but not shared nonmail folders like Calendar , see By default, shared mail folders are downloaded in Cached mode in Outlook and later versions. As an alternative to Public Folders, consider Site Mailboxes. Site mailboxes improve collaboration and user productivity by allowing access to both SharePoint Server documents and Exchange email that is in the same client interface.
A site mailbox consists of SharePoint Server site membership owners and members , shared storage through an Exchange Server mailbox for email messages and a SharePoint Server site for documents, and a management interface that addresses provisioning and life-cycle needs. Depending on which mode and settings are enabled, by changing the amount of data to synchronise can affect the time it takes Outlook to open as well as the amount of storage space Outlook uses on your computer.
Outlook reads and writes items into the. Typically, latency might be higher and cached mode will accommodate this. Outlook: Online Mode vs. Cached Exchange Mode. Share on facebook. Share on linkedin. Share on twitter. Share on google. By Matt Holthouse.
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