Exchange 2007 how to migrate correctly!

Friday, June 20, 2008
By Edwin

In the field we experienced some problems with delegates after removing the last 2003 exchange server from the domain.

If the client software is older (2000 or 2003) then Outlook 2007 and you delete the last 2003 Exchange server from the domain you are not able to use delegates anymore.

This only involves migrations from exchange 2003 to 2007 that are installed in the same organisation and where the mailboxes are moved between exchange 2003 and exchange 2007.

So the correct way to migrate is.

Upgrade clients to outlook 2007

Migrate from Exchange 2000, 2003 to Exchange 2007

Remove the last Exchange 2003 server.

Microsoft Technet article;

http://technet.microsoft.com/en-us/library/bb288905(EXCHG.80).aspx

Caution:  
Do not delete any Exchange 2003 or Exchange 2000 administrative groups that ever contained mailboxes. The LegacyExchangeDN property on a mailbox from an Exchange 2003 or Exchange 2000 administrative group still references the Exchange 2003 or Exchange 2000 administrative group even after you move the mailbox to a server in the Exchange 2007 administrative group. Office Outlook 2003 and earlier versions use the LegacyExchangeDN property to get free/busy information. If the administrative group that the LegacyExchangeDN property references no longer exists, Outlook will not be able to find free/busy information. In addition, all versions of Outlook use the LegacyExchangeDN property when a user delegates access to folders by using the Outlook client. If you delete the legacy administrative group that the LegacyExchangeDN property references, Outlook will not be able to find the assigned delegated user

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