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581

answers:

2

Needs to be secure and able to handle thousands of users.

+2  A: 

Check out ADAM and AzMan.

ADAM is Active Directory Application Mode. There is a how-to guide at: http://msdn.microsoft.com/en-us/library/ms998331.aspx

AzMan is Authorization Manager. There is a how-to guide at: http://msdn.microsoft.com/en-us/library/ms998336.aspx

Chris Lively
A: 

Microsoft is replacing ADFS with a brand new Identity framework, Zermatt. It is actually quite nice. You might also check out Ping Identity if you are open to a commercial product.

Here is a blog post discussing various alternatives. If you decide you want to investigate Zermatt more deeply, see this post.

Nathan
Zermatt is indeed a good solution, but it does not replace ADFS. Rather, it wraps multiple identity providers, including ADFS.
Craig Stuntz
@Nathan: Zermat is not an ADFS replacement. Further, it has already been superceded by a product called "Geneva". ( https://connect.microsoft.com/site/sitehome.aspx?SiteID=642 ) I wouldn't look for it to become production ready for a while now.
Chris Lively
Thanks for the correction. Geneva is not a re-naming of Zermat, but actually a different, replacement technology?
Nathan