i have to shift smoothly windows domain server ,active directory users and exchange server along with data to linux based environment so that users may not be disturb. can any one help?

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All that comes to my mind is "Cheap, Easy, Good: Pick any two." – Bacon Bits May 12 '11 at 6:24
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closed as off topic by studiohack May 12 '11 at 14:59

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Why would you want/need to switch from the MS platform to Linux but still keep the MS services and features?

Anyhoo...

You'll need to look at Samba as the basis of your user management. Samba does support a lot of features of AD. I've never used it personally, but I've heard it's possible to migrate to it as your domain controller.

As far as exchange replacements. There are some free ones but also plenty of pay options. There is a great list on the samba wiki

But I'm sorry to say you won't be able to pull off a seamless switch. You will be making too much of a fundamental switch in underlying implementation of a enterprise architecture that you will run into issues that will cause downtime for users. (transferring email to new server, reconfiguring dns pointers, etc, etc)

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