Hi,

Exchange 2010 is running in present environment and recently I have introduced Exchange 2013. There is federation Enabled at Exchange 2010 end with External Exchange organization. When we migrated users from E2k10 to E2k13 Free /Busy sync has stopped working.

Exchange 2k10 & E2k13 in same Exchange organization and no errors found in configuration part and all seems Success.

Here what I am suspecting, something that I need to do at F5 load balancer end, not sure what :( .. I need urgent help from Experts in this forum to help me in case I have missed something to make Federation working. 

Hello.

After migrating and move arbitration mailboxes federation, i think, you need to re-enable the federation again not with Exchange 2010 and with new Exchange 2013.

Create an organization relationship

Disable or Re-enable federated sharing for your Exchange organizati

Nope Even this it is not working ... I checked before and after federation mailboxes move ... From my side to partner company able to see free /busy but, partner users are not ?

I have asked by Secuity guys to check firewall , tracert ping & telnet all seems fine from both end.

Hi.

Federation in coexistence mode runs through the Exchange 2013.

Coexistence with Exchange 2010

In organizations that contain both Exchange 2010 and Exchange 2013 servers, users who have a mailbox on an Exchange 2010 Mailbox server can use organization relationships to share free/busy information with recipients in external Exchange 2013 federated domain organizations. The Exchange 2010 Client Access and Mailbox servers must be running SP2 or higher, and you must have at least one Exchange 2013 Client Access server in the Exchange 2010 organization.

Troubleshooting plan

1) Check run correctly Exchange CAS 2010/2013
2) Enabled Outlook logging and checked the logs. For Client from Exchange 2010 and Exchange 2013 mailbox.
3) Ran Test-OrganizationRelationship on Exchange 2010 and Exchange 2013.
4) Checked the Federation settings on Exchange 2013.
5) On Exchange 2013 and 2010 server: Get-FederationTrust | Set-FederationTrust -RefreshMetadata