tracking system?

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I was wondering what people have used successfully for their foreclosure tracking system. Has anybody used off-the-shelf products? Any applications that are writtten specifically for foreclosures helpfu?

What about Excel? Do you spend a lot of time tracking potential properties or do you just upload the addresses, send out mass mailings and then focus on properties when the homeowner makes contact?

When do you decide that a property is "folder" worthy? Thanks for sharing!