

Outlook automatically updates the cached data, whenever you are online, by connecting with the Exchange mailbox. It allows you to work offline and to perform different actions, such as read/write emails, search emails, etc.

When Outlook Cached Exchange Mode is enabled, you don’t have to depend on Internet connectivity to access your mailbox. Technically, it creates a replica of your Exchange mailbox in an Offline Storage Table (.OST) file.Īlso Read: How to Change the Location of Outlook OST? In this mode, Outlook caches your Exchange mailbox and Offline Address Book (OAB) on your local system. We have also mentioned about a software that can help you access an orphaned OST file.Ĭached Exchange Mode is an Exchange connectivity mode that offers a seamless online and offline experience to users of Microsoft 365 and Microsoft Exchange Server mailboxes. We have provided stepwise instructions to configure Cached Exchange Mode in different Outlook versions. To disable Cached Exchange Mode, repeat the steps but uncheck "Use Cached Exchange Mode".This article explains what’s Outlook Cached Exchange Mode and how it works.

The default setting is 12 months - change this to your preference.

A copy of your mailbox and GAL (Global Address List) is cached on your computer. Cached Exchange Mode can provide you with a better experience when you use Outlook.
