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I managed to find the .ost files under the old domain profile but cant open them in outlook.

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Posted by waqasahmad

http://office.microsoft.com/en-us/outlook/HA010563001033.aspx

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Posted by Hash007

In Microsoft Office Outlook 2003, a new offline folder file format is introduced that offers greater storage capacity for items and folders and supports multilingual Unicode data. An offline file folder is used to keep a local copy of your Exchange Server mailbox on your computer. The items in your .ost file are synchronized with the server when a connection is available.

Steps for offline file folder:-

1. On the File menu, click Work Offline.

2. Select or clear the Prompt me at startup so I may choose to work offline or online check box, and then click OK. If you clear the check box, Outlook will automatically start offline if a connection to the server is not available.

3. Click Yes to copy the data from the server to your new Offline Folder file (.ost).

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Posted by jarid_alton