hi,

We are experiencing issues with Outlook 2013 on an onpremise Exchange 2013 system.

the issue only affects users with Outlook 2013 and messages queue up in the outbox until we restart Outlook. 2010 users are fine.

The article http://support.microsoft.com/kb/2862523 describes the issue exactly but i wanted to know if anyone has fixed this issue without disabling SPI on the firewall. The article says it is a temporary workaround as it puts the clients at risk and the last update was July 2014.

Microsoft have already verified the on premise Exchange setup as we opened a call with the Exchange team before we discovered the article.

in case anyone else has this

the issue was down to a cisco device doing deep packet inspection

https://support.microsoft.com/en-gb/kb/2862523