Outlook 2013 connectivity issue

Hello!

My Outlook 2013 stopped connecting to my Exchange 2013.  After googling for a while I found this article:

http://infused.co.nz/2013/05/13/exchange-2013-outlook-anywhere-rpc-settings/

and checked get-outlookprovider status -  it was exactly as in this post:

Name                          Server                        CertPrincipalName             TTL
----                          ------                        -----------------             ---
EXCH                                                                                      1
EXPR                                                                                      1
WEB                
I don't know whether this is the cause of my issue or not but I'd like to know: if Exchange Server
 has all required certificates installed why CertPrincipalName is empty in the output above?

Thank you in advance,

Michael