Upgrading server 2008 DCs to server 2012 R2

My question is, the forest level right now is at 2003. Should I set it to 2008 or 2008 R2 or just leave it as 2003?
Just wondering if there is any benefit to changing it from 2003?
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vmichAsked:
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Scott CSenior EngineerCommented:
You will be fine leaving it at 2003  unless you need some of the functionality of a 2008 level forest.

https://technet.microsoft.com/en-us/library/understanding-active-directory-functional-levels(v=ws.10).aspx

But since you are running fine now you will be ok leaving it as is.

However, after your upgrade I would suggest changing it to 2012 R2.
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Benjamin VoglarIT ProCommented:
Best Feature after 2008 R2 Domain forest level is Password Policy.
you can have password policy for example:

- standard users must have (8+ password length, 1 year aging ...)
- remote users (15+ password length, 2 years aging ...)
- domain admins (25+ pass length, 6 month aging ..)

This is impossible in 2003
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vmichAuthor Commented:
run both
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