Hybrid Migration from Exchange 2016 to office365

Anonymous

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.

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.

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58 answers

Anonymous

2018-02-22T07:41:51+00:00

Hi Roy,

Do you have any other questions about it? If so, please don't hesitate to let us know.

Best Regards,

Erick
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Anonymous

2018-02-19T08:01:09+00:00
Hi Roy,

About certificates, the answer is no. Generally, when you run the Hybrid configuration wizard (HCW), HCW will automatically get these certificates and let you choose one. You just need to choose the related SSL certificate. In order to display the certificate correctly, you need to make sure the following 4 steps:
1. The Certificate must be a third party trusted certificate.
2. The proper names must be on the certificate, such as mail.consoto.com or *.contoso.com.
3. The SMTP service (the sending and receiving servers) must be assigned to the certificate.
4. The certificates must have a private key.
Here is a reference:

https://blogs.technet.microsoft.com/exchange/2015/09/04/introducing-the-microsoft-office-365-hybrid-configuration-wizard/

For the PAC file, we recommend you bypass the forward proxy if it is possible. If not, you can add the related IP ranges to your firewall. Please check the information in the link below:

https://docs.microsoft.com/en-us/microsoftteams/office-365-urls-ip-address-ranges

If you have any questions when doing that, please feel free to let us know.

Best Regards,

Erick
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Anonymous

2018-02-19T03:11:42+00:00

Hi Eric,

Just one more question on this?

Do we need to use PAC file? currently we don't us proxy server just a PA firewall.

Thanks

Regards

Roy
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Anonymous

2018-02-19T01:19:05+00:00

Quick question on the certificate

We already have SSL certificate on our exchange 2016 server, so part of this Hybrid migration do we need to export that certificate and import into the Wizard again? Or should it detect from the exchange server.
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Anonymous

2018-02-18T11:15:24+00:00

Thanks Erick,

I will confirm next week if i have any more questions on this as I will be implementing this towards end of next week.

Thanks

Regards
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