Migrating from a server 2003/2008 domain to 2012

Soldato
Joined
27 Mar 2003
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2,710
Hi guys, wondering if someone can assist with this in some way. More after qualification about a position upgrade route and if what I am potentially going to propose is sensible or if I am talking complete *expletive*

Although I am a developer by trade (these days) I have a lot of support knowledge and the current support team for our business is looking to do a wholesale upgrade off all older servers running 2003/2008 to 2012 and at the same time upgrade our Exchange 2003 farm to 2013.

I know a massive project to try and implement. (I say massive it is probably the best part of 40 servers and 6 exchange boxes (1 front end, 5 back end)

Now I understand that tech has move on a lot since this was implemented and am informed that exchange no longer needs the front end/back end setup and can just have a single server or several servers working in unison. The business is looking to transfer all the mailboxes and public folders (approx. 1000+) to one uber exchange 2013 box. Is this sensible or should it be split across multiple instances? The plan is to remove all our remote exchange boxes onto one site and these boxes have 400+ mailboxes sat on their servers.

In addition to this our AD, GPO, security and distribution groups are a horrendous mess. After years of what seem to be mismanagement by previous support staff there are a million and one AD accounts, security groups and gpo's that no one has a clue what is going on and then to top it off the security groups aren't really being used properly and individual user accounts have been granted specific access rights to various network folders across the corporate lan. So it is nightmare to manage and ensure the right people have the right access.

Now I have come up with two options (although I think option 1 is wrong from the get go) which are:

1) Create a clean 2012 domain that runs in parallel to the live domain and create a trust between the two domains and migrate groups of users at a time until everyone has been removed from the old domain and then transfer all domain services like dhcp, dns etc over to the new domain and then turn just switch the old one off. (I'm not sure how the new exchange infrastructure will work in this scenario)

2) Create new 2012 servers in the live domain and then create entirely new ou's gpo's, groups, file shares etc. for users and then migrate them over as and when we can. Test them out and then slowly migrate other services over to 2012 machines. Once all the old policies etc. have been emptied of live users etc. then we can just delete these from the system and we should be left with a nice clean domain and something that is more maintainable moving forward.


Now I guess number 2 is probably the way to go as it has less risk involved as we can just decommission older servers as and when we are ready to. I also think it would probably be easier to get the 2012 Exchange environment working in this scenario.

Now does what I am proposing from a conceptual point of view seem sensible or is there a third or maybe a fourth option to consider.

One thing I was potentially thrashing about is linking the new 2012 servers up to azure and then having this as potential failover for our remote sites (Would this then remove the need to have local AD servers on these sites?)

Again it has been a while since I used my support skills for any length of time so just wondering if this is considered the best solution.

Thanks in advance for any assistance.
 
How many of them 1000 are users that have left the company I wonder?

There are about 250 people within the business. But due to the nature of our business we have mailboxes that are created for specific needs like contact mailboxes for a particular client etc.

There is probably a couple of hundred that can be removed but we would still be looking at around 400 - 600 active mailboxes at the moment.
 
Thanks for all the advice. I was kind of going down the second option and confirmed it with an old work mate that has recently been doing some of this type of work.

So I feel more confident in suggesting this as a possible upgrade route to try and unbundle any hidden nasty things sat in our ad. No doubt something will break as they tend do when embarking on such a big project but at least as long as we do it in baby steps we can resolve anything before it impacts the business.
 
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