In the console tree of ISA Server Management, click
Cache.
In the details pane, click the Cache Rules tab and then
select the applicable cache rule.
On the Tasks tab, click Edit Selected Rule.
On the Advanced tab, select Enable caching of content
received through the Background Intelligent Transfer Service
(BITS).
Notes
To open ISA Server Management, click Start, point to
All Programs, point to Microsoft ISA Server, and then
click ISA Server Management.
For ISA Server 2006 Enterprise Edition, expand
Microsoft Internet Security and Acceleration
Server 2006, expand Arrays, expand
Array_Name, expand Configuration, and then
click Cache.
For ISA Server 2006 Standard Edition, expand Microsoft
Internet Security and Acceleration Server 2006, expand
Server_Name, expand Configuration, and then
click Cache.