Upgrading Exchange Server 2007 to 2013. What is the best way to do this?

I currently have Exchange Server 2007 running on Windows Server 2008 R2.  I would like to upgrade to Exchange 2013. (I see 2016 is released but I am hesitant to go that far yet.)  We have about 200 mailboxes.  What is the best way to do this?
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MASEE Solution Guide - Technical Dept HeadCommented:
Please check this first

Then check these

For co-existence you need an additional name (legacy.domain.com) for Exchaneg2007 to work and an additional external IP to work from external network.

Here is a step by step guide

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AmitIT ArchitectCommented:
You cannot upgrade from 2007 to 2016 directly. So, moving to 2013 will be better in your case. If you still want to move to 2016. I suggest you to target it after 6 months. Still product is new and Microsoft has not provided all information about upgrade plans. Till now from 2010 to 2016 migration plan is available from MS.

What is the best way?
It totally depends on your company requirement.  Do you want to introduce DAG or High Availability for users in 2013. Your user base is low, so, I don't see much challenge in moving to 2013. However, make sure you are also upgrading client OS and Outlook to supported version. So, you can perform smooth migration.

Also, there are tools you can use for 2007 to 2013 migration. One is Exchange deployment assistant. Next is Exchange 2013 calculator for proper sizing. Best to setup in test first and perform the migration. This way you will get the hands-on exp on 2013. As 2013 GUI is very different from 2007 and you will struggle in beginning.

Let me know, if  you need more info.
PhilshAuthor Commented:
Almost all current users are on Windows 7 and Outlook 2007.  Will this work with Exchange 2013 reasonably well?
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AmitIT ArchitectCommented:
Win 7 is fine. Outlook 2007 is supported with 2013. Make sure you have all Outlook updates install before you start 2013 migration. In case you are planning for 2016. Then you might need to upgrade them to Outlook 2010 or 2013 or 2016.
Will SzymkowskiSenior Solution ArchitectCommented:
As MAS has already provided the link the Microsoft Exchange Server Deployment  Assistant is the best high level method to ensure that you have all of the correct steps in order. Based on questions about your environment and where you plan to place your Exchange servers.

Make sure that you have all of your steps in place before the update is critical in the success of the mail transition.

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