Installing your first Exchange 2010 CAS or the truth about Exchange2003Url – Part 1
The Exchange2003Url is a new parameter in the Set-OwaVirtualDirectory cmdlet on Exchange 2010. Although Microsoft documentation clearly states that "The Exchange2003Url parameter specifies the Outlook Web App URL for Exchange 2003 mailboxes." It is all over the net that this parameter is also used to redirect requests to Exchange 2007 mailboxes!
I have no idea where this idea is coming from but I can assure you that is not the case.
Upgrading from Exchange 2003 to Exchange 2010
If you are upgrading from exchange 2003 you should know that an Exchange 2010 CAS cannot communicate directly with an Exchange 2003 mailbox. Thus you will need to publish at least 2 URLs one for your Exchange 2010 CAS and one for you Exchange 2003 Back End server or Front End server.
We will assume that https://owa.yourdomain.com/owa will point you to your exchange 2010 CAS server and https://ex2k3.yourdomain.com/exchange will give you access to your exchange 2003 back end or front end server.
By running, on your Exchange 2010 server,
Managing certificates in Exchange 2010
If you are familiar with Exchange 2010 and trying to install Exchange 2010 for the first time you should have already noticed that the powershell cmdlets used to request and install certificates in Exchange 2007 no longer work in Exchange 2010.
For instance running
New-ExchangeCertificate -GenerateRequest -domainname mail.contoso.msft,autodiscover.contoso.msft,myserver,myserver.internal.contoso.msft -FriendlyName mail.contoso.msft -privatekeyexportable:$true -path c:\cert_myserver.txt
will fail with the following error
A positional parameter cannot be found that accepts argument ‘-Path’.
+ CategoryInfo : InvalidArgument: (:) [New-ExchangeCertificate], ParameterBindingException
+ FullyQualifiedErrorId : PositionalParameterNotFound,New-ExchangeCertificate
and running
Import-ExchangeCertificate -path "c:\CertNew.cer"
will also fail with the same error
A positional parameter cannot be found that accepts argument '-path'.
+ CategoryInfo : InvalidArgument: (:) [Import-ExchangeCertificate], ParameterBindingException
+ FullyQualifiedErrorId : PositionalParameterNotFound,Import-ExchangeCertificate
So here are the commands you should use for Exchange 2010
