Migration from SunOne messaging to Exchange 2010

Hi,
Our organization is currently using Sun One messaging  mail server  with solaris 10 plat form. Recently we bought sharepoint and  wnat to migrate our mail platform to Exchange 2010.The current Sunone  mail is using its own ldap databse and has no intgration with active directory. In other words   mail  boxes in sun server  has no connection with active directory.

We have an Active directory domain (xyz.com)which is  local.   Mail communication is taking place through a registered domain(abc.com).   Is it possible to install the exchange 2010 in the local domain (xyz.com)  and  send/receive mails on abc. com  ? or shall we have to change the domain to abc.com ?
All the mail boxes  from sun will be  backed up as pst files and exported to Exchange  mail boxes manually.  Will there be any problem ?  
Looking for a solution.
Regards
urcit
urcitAsked:
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JuusoConnectaConnect With a Mentor Commented:
1- Install Exchange server in the local domain xyz.com
##Assuming that xyz.com is your internal fqdn, then yes##

2- Since the naming conventions are different in Sunone and LDAP  and Active directory   users should  get the same mail ids. When mail boxes are created  in exchange  the mail ids will be @xyz.com. so Each user should be given an alias and  and  mail address to be created for each user @abc.com.
##For this you will need to add accepted domains, there are three kinds, you will create one accepted domain that is authorative, this will be your public domain "@abc.dom", then you will create another accepted domain which will be set to internal relay "@xyz.com"
Once these accepted domains have been created and configured you will need to create an email policy that applies to the users in your organization##

3- backup  mail  boxes from sun one as pst files and export to  exchange.
##Sounds good##

Cheers
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JuusoConnectaCommented:
Your external domain name does not have to be the same as your internal domain name, rather said it SHOULD be different.
As long as you have your MX records of your external DNS (web-registered domain) points to the exchange servers public ip address (or single point of contact) it does not matter which domain you install the exchange server at.

Backing up the mailboxes as .pst files is fine. You can later on import the .pst files manually or thru Exchange Management Shell once you've installed exchange 2010,

cheers
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urcitAuthor Commented:
Some more clarity required.
I assume that  the process is like this.
1- Install Exchange server in the local domain xyz.com
2- Since the naming conventions are different in Sunone and LDAP  and Active directory   users should  get the same mail ids. When mail boxes are created  in exchange  the mail ids will be @xyz.com. so Each user should be given an alias and  and  mail address to be created for each user @abc.com.
3- backup  mail  boxes from sun one as pst files and export to  exchange.
This  is what I understnad from the current solution.

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