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Outlook 2013, Exchange 2013 and Sharepoint 2013 not synchronizing Tasks.

Last Modified: 2015-10-26
I have set up SharePoint and Project server 2013, we upgraded to exchange 2013 from 2010 about 3 months ago, I have set up the prerequisites for task synchronizations, ran all the commands and program synced them together. When I try to synchronize with outlook I get the following error sharepoint, project and mysites:

"We weren't able to sync your tasks. This could be because your mailbox is on an Exchange server that isn't supported for syncing tasks. Please contact your administrator for more help."

At this point I am not familiar enough with SharePoint to even begin troubleshooting where to start with an extremely vague error. I looked in the logs (C:\Program files\Common Files\Microsoft Shared\Web Server Extensions\15\LOGS and event viewer) I don't see anything to point me in the right direction.
 a few sites said that you need to use the server name for the exchange server (exchangeservername.domain.com) and not an alias(mail.domain.com), I set that up and got the same thing. they also said to check that there are not two IP's registering in DNS for that server name. I only have one IP in my DNS internally mail is a static a record to the same ip as the server. Someone said the certificate could be causing it by not having the correct names but both the server name and the alias is on the cert. Does anyone know where I can look to see if what the problem is or how to tell?

*** EDIT ***
I would also like to say that this sharepoint and project server was upgraded from 2010 to 2013.
Also all sites are upgraded to 2013, nothing is runnning in 2010 mode.
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