Outlook always updating cached messages

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His professional career includes stints as a computer tech, information editor and income tax preparer.Sembera now writes full time about business and technology.If you must keep Outlook 2016 from creating a new compressed Outlook data file (.ost), use the Group Policy template for Outlook (Outlk16.admx) to enable the Do not create new OST file on upgrade policy setting.For more information about how to configure this and other settings, see Using Group Policy and the Office Customization Tool (OCT).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 file.Mailbox data is only cached in memory and never written to disk.

The format that Outlook uses to store data locally for Cached Exchange Mode is less space-efficient than the server data file format. When upgrading, if you do not change Cached Exchange Mode settings, the same settings are kept for Outlook 2016.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.

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