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Hybrid Calendar sharing with AD FS

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I am working on an implementation plan for Exchange hybrid as a migration path to Exchange Online with some unique organization political, as well as environmental challenges. There is also the possibility that a significant portion of their mailboxes may remain on-prem for an extended period of time (maybe years) so some things which I would typically allow to exist sub-optimally temporarily, may not be able to be ignored. It is a single Exchange 2013 server Exchange organization with 600 mailboxes. I can't remember which CU exchange is on currently, but it is my MO on Exchange to update it to the newest CU or RU which is at least 2-3 weeks old before doing any significant modifications or migrations in the Exchange Organization, so it will be assumed.

I am trying to determine if AD FS is necessary. It would be ideal if AD FS was not needed - at least long term. They use shared calendars extensively, for users and room calendars. From a previous migration, I thought that I had a latent memory of setting up AD FS to solve some sort of cross-premises permissions problem, but couldn't quite remember what it was. (if it even existed?) From the documentation I am finding, it is not possible to edit a calendar on one side of the hybrid organization from the other in any configuration. I am 95% sure I did do this on another migration however, so it is bothering me - it is a problem not to mention if cross-premises editing is needed. I could also swear that I have read documentation in the past that AD FS provided some extra cross-prem permissions which dirsync alone does not. I have gone through a few forums and found references to articles which sounded like they had the answer to my question which were pulled - such as this one: https://technet.microsoft.com/en-us/library/hh852414.aspx?f=255&MSPPError=-2147217396It

It has been a while since I have done a project which left a portion of mailboxes on-prem for an extended period of time, (the last I can remember finished in mid-2014) and haven't had to deal with this in a while. I don't have access to any hybrid environments either among any of my clients at the moment to test with.

Does anyone know what I am talking about? Or am I remembering gibberish?


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