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.
Pack Microsoft Office
Category Microsoft Outlook 2016 / Outlook Options / Delegates
Policy ID
4374b7451adb Internal name
L_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) = 1Policy 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.