This is very similar to another earlier question "Outlook/Exchange Out-of-office unavailable" [http://answers.microsoft.com/en-us/office/forum/office_2013_release-outlook/outlook-exchange-out-of-office-unavailable/006462a8-a693-4389-b07c-6d9a27576449]:
I do not see free/busy time for scheduling, and is unable to setup Out-of-Office Auto-Reply, while I oculd see others calendar content in the Calendar view.
In theory, these problems should be already fixed by KB2850061 but I do have newer Russian Office for home and business 2013 (version 15.0.4675.1003) and those problems are still here, while KB #2850061 seems to be inapplicable. What is the newer KB fix which is replacing 2850061 which would be working for my verison?