the name on the security certificate is invalid exchange

Hi,

We have Exchange Online, Exchange 2013 and exchange 2010 coexistence. Is an Hybrid deployment

2010:

1 server (mbx, cas, hub)

1 server (edge)

2013

2 servers (mbx, hub/cas)

1 edge

And we have mailboxes in Office365 (exchange online)

First we are trying to shutdown our 2010 infraestructure. We begin with the mailbox/cas server. 

I shutdown the server and in all outlook clients that mailboxes are in exchange 2013 appears a certificate error when open outlook:

http://www.petenetlive.com/KB/Media/0000036/00001.png

"The name of the security certificate is invalid or does not match the name of the site"

We added the IP from our mbx 2010 to 2013 but doesnt work

any ideas???

helpppp