GPO tool

Group Policy made searchable

A free ADMX browser or comparison tool for IT administrators.Search policies, find registry keys, and see exactly what each setting writes to the Windows Registry. Or compare two GPO backups to see exactly what has changed between them.

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Do not create new OST file on upgrade

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 Information

VendorMicrosoft
ProductMicrosoft Outlook 2016
CategoryMicrosoft Outlook 2016 › Account Settings › Exchange
Applies toUser Configuration
Supported onWindows7
Registry Key[HKCU]softwarepoliciesmicrosoftoffice16.0outlookost
Value Namedonotcreatenewostonupgrade
TypeREG_DWORD
Enabled value1
Disabled value0

Registry File (.reg)

Windows Registry Editor Version 5.00

; Enable the policy
[HKEY_CURRENT_USERsoftwarepoliciesmicrosoftoffice16.0outlookost]
"donotcreatenewostonupgrade"=dword:00000001

; Disable the policy
[HKEY_CURRENT_USERsoftwarepoliciesmicrosoftoffice16.0outlookost]
"donotcreatenewostonupgrade"=dword:00000000

PowerShell

# Enable the policy
Set-ItemProperty -Path "HKCU:softwarepoliciesmicrosoftoffice16.0outlookost" -Name "donotcreatenewostonupgrade" -Value 1 -Type DWord

# Disable the policy
Set-ItemProperty -Path "HKCU:softwarepoliciesmicrosoftoffice16.0outlookost" -Name "donotcreatenewostonupgrade" -Value 0 -Type DWord