Migrate exchange data from on-premise to Office 365 RRS feed

  • Question

  • Hi,

    I have a customer with Exchange 2007 server with around 300 mailboxes. The customer has decided to go to O365 with hosted email and they have setup DirSync to synchronise the AD users and password. However they would now like me to migrate the exchange mailbox data from the on premise server to the cloud can anyone please offer any advise with doing this?

    Monday, July 7, 2014 5:50 PM


All replies

  • Hello,

    Use Exchange Deployment Assistant to get step-by-step list of migration  tasks: Here is also a good technet article:

    Also CodeTwo Office 365 Migration can be helpful:

    Hope it helps,


    Monday, July 7, 2014 6:21 PM
  • Migration to Office 365 is a vast subject - and there are several possible migration routes, essentially (from Exchange 2007):

    - Cutover

    - Staged

    - Hybrid

    It sounds like the customer already has an Office 365 account and has even configured DirSync? Correct?

    If so, that would leave you with Staged and Hybrid.

    Unless you - or your customer - have something called ADFS configured, the staged option might be preferable.

    You could consult articles like these...

    (There are other sets of articles for other migration options).

    And post questions on the Office 365 forum:

    Please mark as helpful if you find my contribution useful or as an answer if it does answer your question. That will encourage me - and others - to take time out to help you.

    Monday, July 7, 2014 7:01 PM
  • Hi,

    Base on my research, I recommend you refer to the following article to migrate the mailboxes:

    Exchange 2007 cutover migration to the NEW Office 365

    A cutover migration is the simplest way to get all your existing email into Office 365. As the name implies, it’s a cutover from one service to another. Cutover migrations are supported for Exchange 2003, 2007 and 2010; for organizations with fewer than 1000 mailboxes. The setup and process is straightforward and nothing complicated. With any successful migration, some planning and testing of existing infrastructure is invaluable. Make sure that you plan and test the migration prior to trying to implement.

    Hope this helps!


    Niko Cheng
    TechNet Community Support

    Tuesday, July 8, 2014 6:28 AM
  • Have you also checked Exchange server deployment assistant that is available from Microsoft ?

    It would be a better and appropriate approach in your situation. It simply asks few questions about your current configuration and proceed further in right direction based upon your requirement. Please take a look at given link to gather more about this tool :

    Moreover, if you still in suspicion with the data losses concern, you can have a look at this application also ( that could be a good alternative choice for you to proceed a hassle-free migration without getting any interruption.

    Tuesday, July 8, 2014 8:12 AM
  • Hi,

    Any update?


    Allen Li
    TechNet Community Support

    Monday, July 14, 2014 2:25 AM