Policy

Upgrade only the default store

This policy setting allows you to specify that only the default data file is upgraded on the first boot of Outlook. If you enable this policy setting, only the data file associated with your delivery mailbox is upgraded. If you disable or do not configure this policy setting, all Outlook Data Files are upgraded.

Policy
PackMicrosoft Office
CategoryMicrosoft Outlook 2016 / Miscellaneous / PST Settings
Policy ID5882171f5b18
Internal nameL_UpgradeOnlyTheDefaultStore

Registry

Copy registry mappings

HKCU\software\policies\microsoft\office\16.0\outlook\setup\upgradedefaultonly (enabled) = 1
HKCU\software\policies\microsoft\office\16.0\outlook\setup\upgradedefaultonly (disabled) = 0

Policy notes

This policy setting allows you to specify that only the default data file is upgraded on the first boot of Outlook. If you enable this policy setting, only the data file associated with your delivery mailbox is upgraded. If you disable or do not configure this policy setting, all Outlook Data Files are upgraded.

Related policies

Default location for OST filesDefault location for PST filesDo not send meeting forward notificationsLarge PST: Absolute maximum sizeLarge PST: Size to disable adding new contentLegacy PST: Absolute maximum sizeLegacy PST: Size to disable adding new content