Policy
Do not create new OST file on upgrade
Microsoft Office
Policy overview
Key metadata and intent for this policy.
This policy setting controls whether Outlook creates a new OST file when you upgrade to Outlook 2016. The new OST file uses less space on the disk. When a new OST file is created, the contents from the previous version of Outlook are downloaded from the Exchange Server. If you enable this policy setting, Outlook continues to use the existing OST file created by the installed earlier version of Outlook. If you disable or do not configure this policy setting, when you upgrade to Outlook 2016, a new OST file is created, and the contents from the installed earlier version of Outlook are downloaded from the Exchange server.
Registry values
How enabled and disabled states update the registry.
| Scope | Registry location | Type | Enabled value | Disabled value | Copy |
|---|---|---|---|---|---|
| User | Path software\policies\microsoft\office\16.0\outlook\ost Value name donotcreatenewostonupgrade | REG_DWORD | HKCU 1 | HKCU 0 |
Policy elements
Inputs and configuration options exposed by this policy.
This policy has no additional user input fields.