Where are TFS Alerts stored in the TFS Databases? Receiving duplicate alerts after upgrade 2008 to 2010

I recently performed a migration-upgrade from TFS 2008 to TFS 2010. Almost everything is working properly now. However, our team is getting duplicate emails now. I'm guessing this is because I used the TFS 2008 power tools to setup alerts. After the upgrade, I installed the TFS 2010 power tools and noticed that there were not alerts configured. I setup new alerts and now开发者_运维问答 we get duplicates. Is it possible the old alerts configuration is floating around in the db somewhere?

Event subscriptions are stored in the tbl_EventSubscription tables from the Tfs_Configuration database and the team project collection database however manually modifying the databases is not supported. Do you still have a client machine running Visual Studio 2008 with the TFS2008 Power Tools? If so, you could try to use the 2008 Alerts editor to remove the old subscriptions.

Ladislau