Question on Exchange CSR Commands

I have a requirement for providing MS level command to Issue certificate. On their view I am an Exchange expert which I know I am not. They reissue based on their customer requirement as they host multiple company's Exchange.  
Two things, It will help me in future and it will help them as well.
Below is the command I got from from internet. I want the correct syntax as per MS for issuing a new CSR for Exchange 2007, 2010 and 2013. Your suggestion highly appreciated.

Exchange2007
New-ExchangeCertificate -GenerateRequest -Path "C:\cert\mail-arzan-com-kw.csr" -KeySize 2048 -SubjectName "c=, s=Kuwait, I=Safat, o=Arzan, ou=IT, cn=mail.domain.com" -Domainname autodiscover.domain.com -PrivateKeyExportable $True -path "C:\cert\mail-domain-com.csr"

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or this one is correct for Exchnage2007
New-ExchangeCertificate -Generaterequest -subjectname "dc=com,dc=contoso,o=Contoso Corporation,cn=mail.domain.com" -domainname  autodiscover.domain.com -PrivateKeyExportable $true -path c:\certrequest.txt

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Exchange2010-2013
Set-Content -path "C:\CSR\mail-domain-com.csr" -value (New-ExchangeCertificate -GenerateRequest -KeySize 2048 -SubjectName "c=US, s=Teststate, I=TestCity, o=Testorg, ou=Testdept, cn=mail.domain.com" -Domainname autodiscover.domain.com -PrivateKeyExportable $True)

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MAS (MVE)EE Solution GuideAsked:
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LearnctxEngineerCommented:
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MAS (MVE)EE Solution GuideAuthor Commented:
Thanks for your reply.
I have gone through this, There is no key mentioned that.  It is 1024 or 2048?

And what about Exchange2010?
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LearnctxEngineerCommented:
They key size is just the size of the encryption key; either 1024 bit key or a 2048 bit key. Unless you have a reason not to use 2048 (this is also the default value if you don't specify one). Full cmdlet help for Exchange 2007 here: http://technet.microsoft.com/en-us/library/aa998327%28v=exchg.80%29.aspx.

For Exchange 2010-2013 just use the technet help article. Your example seems correct as per the help article: http://technet.microsoft.com/en-us/library/aa998327%28v=exchg.150%29.aspx. I don't have an exchange environment on hand to test. Is it throwing an error when you run the command?
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MAS (MVE)EE Solution GuideAuthor Commented:
I tested in exchange2010 I need to test this in Ex2013
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MAS (MVE)EE Solution GuideAuthor Commented:
Did you get a chance to test in Exchage2013?
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MAS (MVE)EE Solution GuideAuthor Commented:
Thanks
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