I have a test environment with 2 Exchange 2010 servers, 1 Lync 2013 server and 2 Exchange 2016 servers. Our Prod has just Lync 2013 and Exchange 2010.
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About 100 users use the Lync integration with OWA so I am testing the upgrade of 2016 and among other things, the OWA/Lync integration with the 2016 Outlook on the web client. I am struggling trying to get a Windows 7 client with IE 11 working with OWA/Lync. The locally installed SFB 2016 client works but when I launch OWA, the IM integration is not working. When I try to logon, I get the dreaded 'There is a problem with Instant messaging.' I followed the MS article below to configure Exchange 2016. I checked the OWAMailboxPolicy, the Default OWA policy etc and everything looks fine.
![LepideMigrator For Exchange LepideMigrator For Exchange](http://www.techieshelp.com/wp-content/uploads/2016/06/add-job-for-mailbox.png)
The Sign In link is there, it just doesn't work. Note in the MS article below, it specifically states Lync 2013 is not supported but I have read it is, albeit with maybe some limited functionality. I also noticed that if a users mailbox is on Exchange 2010 and the client is pointing to Exchange 2016, when Exchange 2016 proxies the OWA request over to 2010, the IM client completely disappears and I don't even get a Sign In link.
Questions are does this configuration with Exchange 2016 and Lync 2013 really work and if so, what am I missing? Exchange is SP3, RU13 and the Lync 2013 has all the latest CU updates. Exchange 2016 is at CU4.
![LepideMigrator For Exchange LepideMigrator For Exchange](http://www.lepide.com/blog/wp-content/uploads/2015/05/2.png)