Really hoping someone can help me here.

I first installed 2012 OS and 2013 exchange and users were getting 'Unable to open your default folder' when trying to open outlook. After much googling and nothing working I decided to put 2008 R2 on the server with 2013 Exchange. Now i am running into massive issues. 

Firstly i get Internal Errror 500 after putting in credentials for ECP and OWA. I did notice that it is also defaulting straight to this URL after entering password https://localhost/owa/auth.owa

I check the management shell and that connects without any issues. I also logged on to a computer to see what it did. After autodiscover it is not able to log onto server and then it looks like it is look for the old server information from previous server.

Any help would be appreciated. Can i do another reinstall of OS and how am i meant to remove the previous data that it seems the server has found?

Hello

please check eventlogs because exchange/asp generate error and warming log and share error message.

The setting SupportedIPMTypes in the Web.Config file was missing.  Using default value of System.Collections.Generic.List`1[System.String].