What is Cached Exchange mode?
Cached Exchange mode is a feature in Microsoft Outlook that stores a copy of a user's Exchange mailbox on their computer. This mode enables the user to access their mailbox data locally from the offline data file (.ost) even when an Internet connection is not available.
In this mode, when users open a mailbox item, such as an email, contact, or calendar item, Outlook first checks the cache to see if the latest version of the mailbox item is available. If the latest version is available, Outlook displays it. If not, Outlook queries the Exchange server for the latest version of the item.
Cached Exchange mode also speeds up the opening of Outlook items and reduces server load, as it eliminates the need to repeatedly query the Exchange server for the same information. For instance, if Outlook 365 is not updating inbox automatically, the Cached Exchange mode helps to retrieve emails from the local OST file.
Overall, Cached Exchange mode provides users with offline access to their Exchange mailbox, while also improving the performance and efficiency of the Outlook application.