Windows Server 2003 R2 and Windows 2003 Non R2

we have 2 dc's have windows server 2003 standard non-r2 on them.  promote member server has windows server 2003 standard r2 dc.  our forest , domain levels windows 2003. 

my first question is, can windows server 2003 standard r2 promoted dc , work windows server 2003 standard non-r2 dc's have in place. (articles have read not indicate if work or if cause issues.)

secondly, have read various articles, states run adprep.exe cd 2 of r2 version.  states need run on current schema master add r2 schema features can promoted.  correct process? 

thirdly there other process must done prepare such domain prep? 

finally, if can done , decide promote r2 server cause issues in future when decide upgrade windows server 2008 r2?

 

thank in advance assistance. 

1) yes, can have mix of 2003 , 2003 r2 dcs.  however, must prepare update schema.  you'll find copy of adprep in system tools folder on 2003 r2 cd.  run on dc holding schema role, logged in member of hte schema admins group.  allow replication occur before attempt dcpromo 2003 r2 server.

2) yes.

3) forest prep , domain prep both required.

4) no issues.  supported.

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