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An Exchange 2003 Server hosts email for multiple email domains. We are moving one of the domains to Office365. &nbsp;I will call it @a.com. There is a tool in the Exchange Admin Center for batch migration, but it looks like it will grab all domains we have on our server. I don't see a way to move only @a.com while leaving @b.com. I know it is an option to export all mail items for each user to an Outlook pst and import them into the new mailboxes, but I am hoping there is a better way.<br />
@a.com is the only email domain on the server that uses public folders. Is there a best way to migrate all of those? I understand migrating those by way of a pst may take a long time for all the items to show up in Office365, so is it better to move them to subfolders of a shared mailbox?
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An Exchange 2003 Server hosts email for multiple email domains. We are moving one of the domains to Office365.  I will call it @a.com. There is a tool in the Exchange Admin Center for batch migration, but it looks like it will grab all domains we have on our server. I don't see a way to move only @a.com while leaving @b.com. I know it is an option to export all mail items for each user to an Outlook pst and import them into the new mailboxes, but I am hoping there is a better way.
@a.com is the only email domain on the server that uses public folders. Is there a best way to migrate all of those? I understand migrating those by way of a pst may take a long time for all the items to show up in Office365, so is it better to move them to subfolders of a shared mailbox?

Migrating from Exchange 2003 to Office365...multiple domains in 2003 Exchange, best way to move just one?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft server applications are those applications developed specifically, but not necessarily exclusively, on the Windows Server platform. In addition to well-known products like SQL Server, Exchange, Internet Information Services (IIS), Microsoft Dynamics, Forefront, Lync and Sharepoint, they include applications like Skype, BizTalk, Hyper-V, Groove and Commerce Server. Server applications are managed with the Microsoft System Center.