The main difference between 12.4 and 15 is that you need a feature key to unlock the features that you paid for unlike 12.4! v15 is one IOS, no seperate versions like v12. 
On Sep 1, 2010, at 3:17 AM, John Haddad wrote:
> Hi everyone,
> 
> What is the so special about IOS version 15M?
> Will it be installed on old Cisco devices which were running version 12.4?
> 
> Thx,
> 
> 
> Blogs and organic groups at http://www.ccie.net
> 
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Received on Wed Sep 01 2010 - 10:21:27 ART
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