Do I have to setup legacy and coexistence for exch 2007 to 2013 migration

I was wondering if I have to setup the coexistence between exch 2007 and 2013 if we will be doing the migration all in one day. So bacically build the new exch 2013 server and then just migrate all of the users email and then the pubic folders all in the same day.
So I should not need to do anyhting other than setup the new exch 2013 server and then start the  migration?
Is this correct?
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Will SzymkowskiSenior Solution ArchitectCommented:
Well if you are doing this process during business hours how are you going to keep services running? If you can do it all within a weekend I do not see why you couldn't just migrate the mailboxes etc. I would personally just plan for the worst because if you dont have it completed over the weekend or you run into issues a long the way you are going to need a way to keep services running.

I would be following the Exchange Deployment Assistant as a reference.


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vmichAuthor Commented:
Well I have I have been using the deployment assit, but the exch dbs is only 59GB and the public folders is only 700MB. So I dont see any reaso why I should not be able to get the migration done is 1 day so should not really need to setup the coeixtence.
What do you say?
vmichAuthor Commented:
and yes this will all be done starting on a Saturday and Sunday if needed.
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Will SzymkowskiSenior Solution ArchitectCommented:
Well if no users will be complaining about cert issues or be concerned that they may not be able to connect to their mailbox you could probably just do it this way. However doing the complete end to end process is the best practice and supported method.

vmichAuthor Commented:
Ok thanks for the info...
Leroy LuffHead of IT & DIgitalCommented:
I am currently doing the exact same migration but my mailstore is over 500gb

Things to note :

Exchange 2007 has to be SP3 and Cumulative Update 10 for Coexistence - Installing these updates will stop exchange services so do this after hours.

This video tutorial goes through the complete process :

Good Luck
vmichAuthor Commented:
Yes I know of the updates needed for the 2007 I was just wondering if the mirgration could be done without setting up the legacy and coexistenance between the two.
Leroy LuffHead of IT & DIgitalCommented:
I am no expert at exchange but I would say you need to use coexistence.

See the video - Its tedious but shows all steps. ( part 1 is prep and part 2 is actual migration )

Any reason why you prefer not to?
Will SzymkowskiSenior Solution ArchitectCommented:
I am no expert at exchange but I would say you need to use coexistence.
Coexistence will happen because when you add the 2013 Exchange server into the domain at that point it is co-existing. I beleive vmich is relating this to where or not certs/url etc need to be configured to complete this process. i.e. etc.

Leroy LuffHead of IT & DIgitalCommented:
Thanks Will,

A question from my side :

I want to have my Exchange 2013 servers running in a DAG.

Do i 1st setup the DAG then migrate the mailboxes and roles to the 2013 or do I 1st migrate complete to 2013 standalone and then setup the DAG

Thanks Leroy
Will SzymkowskiSenior Solution ArchitectCommented:

I would be happy to answer this question if you open a new one. Please do not hijack this thread. It is part of the general rules of asker/experts.

Leroy LuffHead of IT & DIgitalCommented:
vmichAuthor Commented:
coexist setup
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