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As we know Exchange 2010 SP 3 is prerequisite if you are planning to migrate it to Exchange 2013. Let us go ahead with updating our Exchange 2010 to SP3 (Service Pack 3).
In larger environment, it is always preferred to update the Active Directory Schema separately\manually. This is because you may have the schema master and Exchange Servers in different AD sites.
Another reason is the person responsible for Active Directory (Schema) may not be the same person that will upgrade Exchange Servers.
First of all extract the content of Exchange 2010 SP3 on a folder on C: Drive of any Domain Controller (Schema Master) and run:
Setup.com /PrepareAD
To validate if the Schema update is successful or not, use ADSIEdit.msc and open the Schema partition and check the properties of Ms-EXch-Schema-Version-PT:
The rangeUpper value should be 14734.