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Can we downgrade Domain functional level from Win2008 R2 to Win2008

Last Modified: 2015-03-04
We are planning on upgrading our Domain/Forest functional level from Windows 2003 to Windows 2008 R2.  I understand we cannot go back to Windows 2003 DFL once we upgrade to Win2008 R2, without going through the Forest Restore.  We have some older software that we need to continue to support and have verified with the vendor that this software will run OK if we upgrade straight from Win2003 DFL/FFL to Win2008 R2 DFL/FFL.  My question is, in spite of our discovery if we encounter some type of issue with one of these applications running in the Win2008 R2 DFL can we downgrade to Win2008 DFL/FFL?
Thank you,
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