The following hot-fix KB articles for Exchange Server 2010 were released.
- 2800080 ErrorServerBusy response code when you synchronize an EWS-based application to a mailbox in an Exchange Server 2010 environment
- 2797529 Email message delivery is delayed on a Blackberry mobile device after you install Update Rollup 4 for Exchange Server 2010 SP2
- 2787500 Declined meeting request is added back to your calendar after a delegate opens the request by using Outlook 2010
- 2779387 Duplicated email messages are displayed in the Sent Items folder in a EWS-based application that accesses an Exchange Server 2010 Mailbox serve