Following was noticed today:
I am getting error on 4 out of 50 mailboxes with the error: Free\busy information is not available
I'm getting this just browsing calendars in Outlook 2013 as well as using scheduling assistant.
When using scheduling assistant on the OWA, I am able by selecting show error to get this description:
Free\busy information couldn´t be retrieved because the attendee's MailboxServer is busy
Results shown in https://www.testexchangeconnectivity.com/ don't help either. Except that the 4 users that I have issues with do get error, while the rest don't.
Could use some help. - does Office 365 have some issues - don't seem to show any Exchange health issues.