ADFS Post DirSync Installation

We have an Office 365 installation which currently uses DirSync to synchronise user accounts and passwords.

We are looking at introducing another product which uses ADFS. We avoided implementing ADFS for Office 365 due to the additional cost and complexity, hence the reason just for installing DirSync for providing same-sign-on.

As it looks like we now need to use ADFS, do we have to do anything with DirSync if we decided to use ADFS for Office 365 as well?
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you will need to remove or disable dirsync if you are planning to introduce office 365.

Refer the below link for ADFS with O365
Shreedhar EtteCommented:
If you decide to use ADFS then still you have to have DirSync in place to sync objects between local AD and Azure AD.
Vasil Michev (MVP)Commented:
Dirsync is a prerequisite for using AD FS with O365, so you need to remove it.  And you will probably not need to make any adjustments in order for it to be able to work OK with AD FS. The important part is to make sure that all the users are correctly synced and their on-prem UPN matches the cloud one.

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HypervizorAuthor Commented:
@Vasil - if Dirsync is a prerequisite for using ADFS with Office 365, why would you need to remove it?

Based on the comments above, there seems to be suggestions that you do and don't, so it's currently not very clear. Any further advice appreciated.
Vasil Michev (MVP)Commented:
Oh drag, what I meant to say is DO NOT need to remove it. Sorry, should have read my post before I press Submit.
HypervizorAuthor Commented:
OK, thanks for clarifying - that makes sense.

Do you have to do anything else prior to or following the installation of ADFS?
Vasil Michev (MVP)Commented:
Review the documentation, make sure the server and PCs are properly configured so you can take advantage of the seamless SSO experience. And talk to your users, let them know you will switch the auth mechanism, so they at least have an idea what's going on.

You can also take advantage of the options AD FS gives you to control access outside of the corporate environment. But as far as dirsync is concerned, you should be all set.
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