Why is free\busy information unreliable after hybrid migration to Office 365
Posted on 2015-01-20
Office 365 Enterprise E4
Outlook 2010 (downloaded\installed via 365 site)
Migrated from Exchange 2003 on premise to 365 via Hybrid deployment (EX2010)
New users added in on premise AD, then synced using on premise directory sync server
Client Outlook 2010 configured by running through setup onetime (auto discovery), enter username\password, click always remember, done.
Problem is free\busy area. User A invites user B & C to meeting. Can see B free\busy, but for user C, user A gets slash marks with message “No Information, No Free/busy information could be retrieved & you do not have permissions to see the recipient’s free busy.”
In Outlook, if user C opens his calendar permission properties, removes the name “other”, then closes. User A can then see free\busy. I’ve tested this procedure with several other same situations. It takes care of the issue, but always reverts back.
I’ve tested in OWA, and get the same results.
Any troubleshooting tips would be appreciated.