Free/Busy issue between and two Exchange on Line organizations, one hybrid

New Contributor

Hello,

here is my scenario. I opened this question to the M365 support teams, but it has been closed withou being solved, so I'm trying to ask the same to the community.

  • Contoso.com is a cloud only Exchange on line organization
  • Fabrikam.com is a Hybrid Exchange on line organization with HCW classic full and and Exchange 2016 on-prems server. Of course, autodiscover references the on-prems Exchange server.
  • There are a federation trusts and Organization relationships between Contoso.com <-> Fabrikam.com (EOL) and Contoso.com <-> Fabrikam.com (EOP)
  • userC1 is a mailbox user in Contoso
  • userF1 is a mailbox user in Fabrikam (EOP)
  • userF2 is a mailbox user in Fabrikam (EOL)

This is the issue:

UserC1  is trying to get Free/busy informations of a userF1 calling the primary SMTP address userf1 <at>fabriam.com successfully

UserC1  is trying to get Free/busy informations of a userF2 calling the primary SMTP address userf2 <at>fabriam.com NOT successfully (in remote connectivity analyser I can see the redirect to the target address to domain fabrikam.mail.onmicrosoft.com

UserC1 is trying to get Free/busy informations of a userF2 calling the alias SMTP address userf2<at>fabrikam.mail.onmicrosoft.com successfully

 

I think I must have made some mistakes, because I think it is not possible that MS has not treat this scenario. May someone help me showing me how can I solve it?

 

Thank you,

 

Enrico

 

1 Reply
Per tutti quelli che hanno lo stesso problema, sono giunto alla conclusione che non è risolvibile.
To Whom who are facing the same issue, I conclude it's not resolvable.
https://techcommunity.microsoft.com/t5/exchange-team-blog/the-hybrid-mesh/ba-p/605910

:(

Enrico