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I'm about to update 300 items in a list that I know lots of users are subscribing to (notification by email on every item update event). I've tried turn this off by using STSADM:

stsadm -o setproperty -url http://[SITE] -pn alerts-enabled -pv false

as well as by using powershell:

$webapp=Get-SPWebApplication $webappurl 

The notifications are still sent out by email. What am I doing wrong?

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If you make the changes using SPListItem.SystemUpdate() then alerts won't be triggered in the first place:

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