Remove email roles from SBS 2011 server

One of our offices has a Windows server running SBS 2011.
It used to do email via Exchange (albeit in a very unusual way), but I've moved all of the users across to our Office 365 cloud email.
I've got an exported copy of each mailbox as a PST file in case I need them, and now I'd like to change the way the server works by removing or disabling the Exchange role.
I don't want to damage the AD configuration though because this server is also a domain controller.

What's the best thing to do here?

The main reason for wanting to do this is to:

1.

regain the system resources (RAM, CPU and HDD) so that we can move our MSSQL/.NET application back onto this server

2.

stop "autodiscover.domain.com" errors in Outlook caused by DNS roles on this server despite the external DNS zone file records all pointing to the Office365 server
LVL 8
Reece DoddsAsked:
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Larry Struckmeyer MVPConnect With a Mentor Commented:
Hi:

Just change the public MX and Auto Discover records and if needed set all the exchange services on the SBS to disabled.
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Reece DoddsAuthor Commented:
Have done this and there appears to be no adverse effects except the odd SSL certificate lookup error but that is due to dns settings within the DC I think.
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