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All you have to do to move Lotus notes to Exchange are:
1. Connect to your Lotus Domino server with Domino Access for Microsoft Outlook (DAMO)
-> Export your whole mailbox data to .pst file format
-> Open your .pst files
2. Connect to your Exchange server 2010
-> Import the earlier created PST files to the Outlook/Exchange server.
The whole process is little bit time consuming. If you don’t have much time and technical skill then stay out of this process as incomplete data migration or data corruption can happen.
You can also try some external utility to perform this task. You can also take help of Export Notes (www.exportnotes.com) software which is specially developed for this purpose. This might be helpful to you to understand technicalities behind Notes to Exchange migration.
I think this is quite expensive for you as you describe * we are staff of 100-200 people, you can use third party utility to export Lotus Notes to Microsoft Exchange format in safe manner such as Mail Migration Wizard, It is online available at just $599 which is very reasonable compare to other utilities and accomplishes migration in Batch mode simultaneous. It performs:
Commercial Links: http://dominotoexchange.taskmanagerfix.com/