Migration Wizard for Exchange Install Guide 6.0
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Migrating from Microsoft Exchange to Zimbra Collaboration Suite : Planning the Migration from Exchange Zimbra

Planning the Migration from Exchange Zimbra
Before you attempt to migrate from the Exchange server, create a communication plan to notify users about the new Zimbra email program and to provide users with the new mail access information (Zimbra URL, login name, and password to use).
Zimbra recommends that you plan to perform the migration during off-peak use times. The Exchange server does not need to be stopped in order to migrate accounts. Any emails that are sent to or delivered from Exchange after the account is migrated are not saved in the Zimbra mailbox.
The ZCS Migration Wizard asks you questions in a series of dialog boxes about how to set up the new accounts. Before you start, you should determine:
Considerations for retaining domain name when migrating
If your users use the Calendar application, and you are not migrating all users to ZCS at the same time, configure ZCS with the same domain name as used on the Exchange server. When ZCS is configured with the same domain name, a user’s existing email address will be retained when the account migrates to ZCS.
Meeting requests and appointments contain recipient information in the form of email addresses. After migration, if the organizer of an appointment updates an existing appointment or if recipients reply to an invitation, the email address of the original message receives the notification. If the email address has been changed, the notification is not received.
Migration options to configure
After the accounts are created on the Zimbra server, the email messages, calendar entries, and contact information are imported. You configure the following rules for accounts being imported:
Import the content of Junk Mail folders, yes/no
Import the content of the Deleted Items folder, yes/no
Should the new email address replace the Exchange email address in all meetings organized by the user? <check box>
By default, messages larger than 10 MB will not be imported. The message size includes the message and attachments. If the message is larger than 10 MB, a warning is logged to the Migration Wizard log file, which can be reviewed from the Import Complete dialog when the migration is complete.
Note: You can modify the following registry key to change the default limit: HKCU\Software\Zimbra\MaxAttachSizeMB. The registry key should be specified in megabytes (MB).You must also change the Maximum size of a message located in the Administration Console under Global Settings>MTA, to match the new registry key value.
The import process contains a few assumptions regarding naming:
Imports are by a single domain. For example, you might import users from marketing.domain.com on your Exchange server to marketing.zimbra.domain.com on your Zimbra server.
The local part of the user’s SMTP address in Exchange becomes the first portion of the email address on the Zimbra server. To continue the above example, a user who has an account for joe@marketing.domain.com on Exchange would become joe@marketing.zimbra.domain.com on your Zimbra server.

Migrating from Microsoft Exchange to Zimbra Collaboration Suite : Planning the Migration from Exchange Zimbra

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Migration Wizard for Exchange Install Guide 6.0
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