Policy

Disable shared mail folder caching

This policy setting allows you to control the caching of shared mail folders. If you enable this policy setting, Outlook will only cache shared non-mail folders. If you disable or do not configure this policy setting, shared mail and non-mail folders you have access to are cached in your .ost file when you add another mailbox to your profile.

Policy
PackMicrosoft Office
CategoryMicrosoft Outlook 2016 / Outlook Options / Delegates
Policy ID4374b7451adb
Internal nameL_CacheOthersMail

Registry

Copy registry mappings

HKCU\software\policies\microsoft\office\16.0\outlook\cached mode\cacheothersmail (enabled) = 0
HKCU\software\policies\microsoft\office\16.0\outlook\cached mode\cacheothersmail (disabled) = 1

Policy notes

This policy setting allows you to control the caching of shared mail folders. If you enable this policy setting, Outlook will only cache shared non-mail folders. If you disable or do not configure this policy setting, shared mail and non-mail folders you have access to are cached in your .ost file when you add another mailbox to your profile.

Related policies

Saving messages sent from a shared mailbox to the Sent Items folderStore deleted items in owner's mailbox instead of delegate's mailbox