Hybrid Migration from Exchange 2016 to office365

Anonymous
2018-02-15T08:36:09+00:00

Hi MS,

I am in the planing phase of doing 10 users Pilot Hybrid migration to office 365 in E3 plan using our Volume licence.

We have two 2016 exchange servers running in DAG

We also have email filtering done via Mimecast and for purpose of this exercise i want to leave email filtering to mimecast and not use EOP.

I want to get a clear idea of exact steps I need to take to configure this.

However, before I do anything i want to make sure it does't affect our SMTP or any other users from reading tons of articles and some previous experience with office 365 this are the steps i think needs to be performed.

  1. use exchange server deployment assistance

 - check prereq - all good

My questions  Questions are 

On step 14

If i add this TXT record this will not affect any mail flow this is purely for domain verification? 

Question 2

on the step 15 -29 here 

https://technet.microsoft.com/en-us/exdeploy2013/Checklist?state=3229-W-EwAIAAAAQAAAAAEAAAAAACAAAABEaAOFAAA~

will that affect any existing mail flow or existing connectors as we have few there

Question 3 

overall understanding is mailflow will still be going through exsting exchange server and other 240 users will not be affected and not other server or services such as smtp, scanning service will be affected due to this. 

We never need to change MX records and we don't have to make any changes to mimecast?

Please clarify these ASAP, would be really appreciated.

Microsoft 365 and Office | Subscription, account, billing | For home | Windows

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  1. Anonymous
    2018-03-26T02:13:46+00:00

    Hi Erick,

    I am referring to those 40 users who are already successfully migrated to office 365. 

    Can I delete their mailboxes on the local on-prem exchange server mailboxes now? As we need to start making some space on the storage.

    Moving forward, once all 350 users have migrated to office 365, I will be removing the storage from the on-prem exchange server and leaving only bare minimum storage space attached. 

    Thanks

    Regards

    Roy

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  2. Anonymous
    2018-03-25T09:32:10+00:00

    Hi Roy,

    The answer is no. We don’t recommend users to do anything for the migration users if the migration has not completed. It may affect the migration users or batches.

    Best Regards,

    Erick

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  3. Anonymous
    2018-03-23T01:45:32+00:00

    Hi Erick, 

    yes, its working not to the clean up tasks

    I have migrated about 40 users to office 365 in Hybrid at the moment but now same user's have mailboxes in office365 and local exchange as well. So its duplicates

    Is it safe to delete their mailbox from local exchange to make space of our storage?

    We have 350 users to migrate and currently using quite a large storage requirement. 

    Thanks

    Regards

    Roy

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  4. Anonymous
    2018-03-18T09:33:44+00:00

    Hi Roy,

    May I know whether everything works well?

    Best Regards,

    Erick

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  5. Anonymous
    2018-03-14T08:58:50+00:00

    Hi Roy,

    The article is related to remote migration (Hybrid migration). You can use the throttling in your scenario. For example, you can change the migration service throttling. However, if you have started the batch, you cannot change it now,

    You can also change the maximum number of MRSProxy connections for the on-premise servers. Here is a reference:

    https://technet.microsoft.com/en-us/library/mt483789(v=exchg.150).aspx

    Best Regards,

    Erick

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