My company just decided to move to Google Apps due to lots of technical issues with our Exchange 2003 server. I have just signed up for the free trial account for Google Apps and one of the first steps required is verifying domain ownership. It has something to do with adding a TXT record or CNAME to the DNS' control panel. I do not have the access of our domain's control panel so I will have it configured by our provider.
Question is will there be any conflict with our existing mail server if the TXT record or CNAME record gets added? Also, when the migration is finished, will Google apps and MS Exchange be able to run at the same time?
Which verification type do you also recommend: TXT, CNAME or both?