CRM 2016 8.1 upgrade to Dynamics 365 8.2.3.8

CRM 2016 8.1 upgrade to Dynamics 365 8.2.3.8

We  have a CRM 2016 v8.1 server that we want to upgrade to D365 8.2.3.8  The system uses the email router and SRS server and this is an in-place upgrade on Production.  We previously upgraded the CRM 2016 Test system but that doesn't user the Email Router (uses Server Side Sync).

To upgrade the 8.1. system fully to D365 8.2.3.8 including the email router and SRS server, are there any conditions or upgrade order that we should be aware of before starting the upgrade?

Thanks
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apollo7Asked:
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Chinmay PatelChief Technology NinjaCommented:
Hi apollo7,

The process is more or less the same as we had in previous version of Dynamics CRM. However, I would recommend that you follow the steps listed here: https://docs.microsoft.com/en-us/dynamics365/customer-engagement/on-premises/plan-your-upgrade-to-microsoft-dynamics-365-server

If you are on 8.1 that means it is still CRM 2016 hence you should remove Email Router and Reporting Extensions:
https://docs.microsoft.com/en-us/dynamics365/customer-engagement/on-premises/before-you-upgrade-issues-and-considerations

PS: Email Router is anyways should be removed from the deployment and Server Side Sync should be used.

Regards,
Chinmay.

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apollo7Author Commented:
Thanks, Chinmay - one other thing, how long would you estimate the production servers would be down for this upgrade?
Chinmay PatelChief Technology NinjaCommented:
It will be based upon the size of the database and the method. If you are going for in-place upgrade then only size is the factor.
apollo7Author Commented:
Just what I needed
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