Office 365 users cannot retrieve an on-premises user’s free/busy data in an Exchange Server 2010-based hybrid deployment
Content provided by Microsoft
Applies to: Exchange Server 2010 Service Pack 3Exchange Server 2010 EnterpriseExchange Server 2010 Standard
Consider the following scenario:
You configure a Microsoft Office 365 and Microsoft Exchange Server 2010 Service Pack 3 (SP3) hybrid deployment.
An on-premises user has a Microsoft Outlook 2013 calendar item in which Working Elsewhere is selected in the Show As box.
An Office 365 user tries to look up the on-premises user’s free/busy data by using Outlook 2013 or Outlook Web App for Exchange Online.
In this scenario, the Office 365 user cannot retrieve the on-premises user’s free/busy data.
Note This issue does not occur if an Office 365 user uses Microsoft Outlook 2010 to look up an on-premises user’s free/busy data.
This issue occurs because Outlook 2013 defines a new Working Elsewhere free/busy value for calendar items. When Office 365 users request free/busy data, the on-premises Exchange 2010 server incorrectly maps the new free/busy value.
To resolve this issue, install the following update rollup:
2891587 Description of Update Rollup 3 for Exchange Server 2010 Service Pack 3
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about how to set Working Elsewhere in Outlook 2013, go to the following Microsoft website: