Policy
Enable throttling for online mail indexing
Windows 11 25H2
Policy overview
Key metadata and intent for this policy.
When using Microsoft Office Outlook in online mode, you can enable this policy to control how fast online mail is indexed on a Microsoft Exchange server. The lower you set this policy, the lower the burden will be on the corresponding Microsoft Exchange server. The default value for this policy is 120 items per minute. To lower the burden on Microsoft Exchange servers, lower the rate of items indexed per minute. If you disable this policy, then online mail items will be indexed at the speed that the Microsoft Exchange server can support. If you set this policy to not configured, then online mail items will be indexed at the speed of 120 items per minute. This policy has no effect on mail items when using Microsoft Office Outlook in cached mode.
Registry values
How enabled and disabled states update the registry.
| Registry location | Type | Enabled value | Disabled value |
|---|---|---|---|
| HKLM\SOFTWARE\Policies\Microsoft\Windows\Windows Search\EnableThrottlingOnlineMailboxes | REG_DWORD | 1 | 0 |
Policy elements
Inputs and configuration options exposed by this policy.
| Element | Type | Registry mapping | Constraints & behavior |
|---|---|---|---|
Number of items per minute ID LimitEnableThrottlingOnlineMailboxes | decimal | HKLM\SOFTWARE\Policies\Microsoft\Windows\Windows Search\EnableThrottlingOnlineMailboxesValue Type REG_DWORD | Range: 6 to 600 |
Other policies in this category
Explore related policies at the same level.
- ComputerAdd primary intranet search locationMicrosoft Windows XP, or Windows Server 2003 with Windows Search version 3.01 or later
- ComputerAdd secondary intranet search locationsMicrosoft Windows XP, or Windows Server 2003 with Windows Search version 3.01 or later
- ComputerAllow Cloud SearchAt least Windows Server 2016, Windows 10
- ComputerAllow CortanaAt least Windows Server 2016, Windows 10
- ComputerAllow Cortana above lock screenAt least Windows Server 2016, Windows 10
- ComputerAllow Cortana Page in OOBE on an AAD accountAt least Windows Server 2016, Windows 10
- ComputerAllow indexing of encrypted filesMicrosoft Windows Vista, or any version of Windows with Windows Search 4.0 or later
- ComputerAllow search and Cortana to use locationAt least Windows Server 2016, Windows 10
- ComputerAllow search highlightsAt least Windows Server 2016, Windows 10
- ComputerAllow use of diacriticsMicrosoft Windows Vista, or any version of Windows with Windows Search 3.01 or later
- ComputerAlways use automatic language detection when indexing content and propertiesMicrosoft Windows 8 or later
- ComputerConfigures search on the taskbarAt least Windows 11