Can Active Directory scale to support millions of users for SharePoint 2010?

Can Active Directory on Windows Server 2003 or 2008 scale to support millions of users for a SharePoint 2010 implementation? Not total objects but total users so there would be additional group objects, etc. Can SharePoint 2010 support this many users as well?

If the answer to both questions is yes are there any implications, gotchas or issues concerning the support of this large a user base both within AD and SharePoint?

Thanks in advance!
RayRay13Asked:
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Adam BrownConnect With a Mentor Sr Solutions ArchitectCommented:
http://old.markharrison.co.uk/blog/2004/09/sharepoint-scaling-limits.htm

Suggests that the limit is 2 million users/groups. You're usually better off creating groups in AD and assigning permissions to those in Sharepoint rather than actually adding lots of users. The only real major issues you would (theoretically) run into is having to manage that many users and the performance of the servers. With over a million users you're going to have a *lot* of work to do and a lot of authentication traffic and processing.
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Mike KlineConnect With a Mentor Commented:
AD can support up to 2 billion objects    http://technet.microsoft.com/en-us/library/active-directory-maximum-limits-scalability(WS.10).aspx#BKMK_Objects

...never been anywhere that even came close to that.

Not sure about scaling to millions of users with sharepoint.  

Thanks

Mike
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Adam BrownSr Solutions ArchitectCommented:
2 million users/groups is the limit for Sharepoint. AD, as Mike mentioned, allows billions of objects.
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Antknee869Connect With a Mentor Commented:
I know of a few very large companies that use AD for user accounts for external facing web sites. They contains many millions of users.
Don't know about Sharepoint, but I wouldn't worry about AD.... if the servers are sized properly
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