Raising Forest Functional Level

My company is a single forest and a single domain. My domain functional level is Win 2003.

My DCs are all Windows 2003 SP2. My member servers are mostly Win 2003 &  2008.  I have couple Win 2012 and a few Win 2000 boxes left. My PCs are Win 7 and Win XP with a few Win 8/8.1.

My two part question is:

1) Any problems with me raising my FOREST Functional Level to Windows 2003?  
(My research suggests I should have no issues.)

1A) If no problem, should I do it now OR wait until  a little while prior to me raising my domain to Windows 2008R2?  
(I am planning for late April-early May upgrade.)
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RussTreAsked:
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Seth SimmonsConnect With a Mentor Sr. Systems AdministratorCommented:
1) you are fine to raise the forest level to 2003 with all 2003 domain controllers

1a) you can't raise the domain level to 2008 R2 until all your 2003 domain controllers are removed.  once you have 2008 R2 (or higher) domain controllers in place and fsmo roles and other services are migrated over and 2003 domain controllers are demoted, then you can raise the level to 2008 R2
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RussTreAuthor Commented:
Thank you.
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