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
    2018-02-27T10:38:28+00:00

    Hi Roy,

    About the certificate, if you use *.domain.com certificate, it is a wildcard certificate. You need to install or import the certificates for your Exchange servers. Here is a reference:

    https://technet.microsoft.com/en-us/library/bb310769(v=exchg.160).aspx

    https://technet.microsoft.com/en-us/library/hh563848(v=exchg.150).aspx     (Please check the table at the botton to verify the SMTP domain, Autodiscover and Transport.)

    For the steps, you need to set up AAD Connect first. The ADFS can be done after you finish the Hybrid. When you configure the AAD Connect, you can run the Hybrid Configuration Wizard.

    When you use Hybrid, you can move on-premise mailboxes to cloud with all data. The exchange online and on-premise retention policies are a little different. The on-premise mailbox with cloud archive still use the on-premise retention policies. The cloud retention policy will be applied for cloud mailboxes. To avoid missing emails, I suggest you check the default retention policies before migration. The retention age will be calculated again from the migration date.

    Best Regards,

    Erick

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  2. Anonymous
    2018-02-28T07:34:28+00:00

    Thanks Erick,

    I am now getting an error when trying to add my domain under the o365 tenancy. 

    "Did you know? Other people in your organisation have already signed up with domain.com" email address. You need to sign up too then verify that you are the admin for the domain. We 'll send you an invitation and walk you through the process of becoming the admin" 

    The person who setup the trial ages ago doesn't work here but i have recreated that email and also tried to sing up with my email and followed up form above message but none of the emails getting any emails from Microsoft/office 365 on the walk through.

    I wonder do we still need to add the domain here? since we are only doing Hybrid, in pilot mode a and we will not be changing our MX records as that's going to our spam filtering system.

    Thanks

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  3. Anonymous
    2018-02-28T10:05:18+00:00

    Hi Roy,

    For my understanding, if you just do a test, you can run Hybrid without custom domain name. However, it may affect your test results. Because I think company always has their own domain name and mail flow. Generally, we recommend you add the domain name.

    Best Regards,

    Erick

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  4. Anonymous
    2018-03-01T00:56:52+00:00

    ok thanks,

    I am trying to add my email to get the invitation email but not getting any emails on my email or even that old email.

    "Did you know? Other people in your organisation have already signed up with domain.com" email address. You need to sign up too then verify that you are the admin for the domain. We 'll send you an invitation and walk you through the process of becoming the admin"

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  5. Anonymous
    2018-03-01T07:32:01+00:00

    Hi Solution_ Pro, 

    We need your tenant information and domain information to check from backend. Please provide the information via private message to protect your privacy.

    Regards,

    Joanne

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