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Hello all,

Here is the situation:

We are migrating from one tenant to another tenant.

O365 tenant to 0365 tenant migration.

we use AD-on premise.

I cannot find a lot of information regarding DirSync, when it needs to be stopped, what the possible issues can be, ETC.

Has anyone had much experience with this? and any pointers / advice you can offer?

Looking forward to responses.

4 Spice ups
2

Please follow below article which summarizes step-wise instructions to work around your situation : How to migrate mailboxes from one Microsoft 365 or Office 365 organization to another | Microsoft Learn

Here is an earlier discussion which has been also suggested some informative tips to accomplish this task - https://community.office365.com/en-us/f/156/t/306949

Moreover, if you are concerned about mailbox migration process, you also also checkout LepideMigrator for Exchange which provides a hassle-free environment in order to get this job done without having downtime.

1 Spice up
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You can refer to the following article about directory synchronization in Office 365.

After DirSync is disabled, the new updates occurred on the local AD cannot be synchronized to Office 365 and any more. However, the existing synchronized users will be kept.

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In addition to the articles above, you should also consider migrating to Azure AD Connect.

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Thanks for the responses guys,

We spend the majority of the weekend discussing concerns with dirsync and in the end just decided to migrate over to Azure AD Connect.

Thanks all for the responses.