This domain Nameserver by godaddy now with outlook DNS, if I change the nameserver to Cloudflare, will it brokedown my outlook?
If you do it correctly there should be no impact on email.
Double and triple check that all your DNS records in Cloudflare match those in your existing DNS provider. I recommend that for the initial change everything is left 
, as this minimises the amount of moving parts in the initial onboarding.
Make sure that DNSSEC is disabled on your old DNS provider.
Then change the nameservers to Cloudflare, and wait 24-72 hours for the change to complete and propagate to the Internet. (It’s usually much faster, but it can take a while)
At this stage only the authorative nameservers have changed, but everything else should be the same.
When you are ready to start changing things to 
to make use of Cloudflare cache, performance and security features, you need to make sure a few things are in place.
The target of your MX record must be , never . Any and all DNS records used for email must be . This includes and records used for IMAP, POP3, SMTP etc. If you currently use the same hostnames for websites as you use for email, you will need to make changes before changing to .
If you use +a in your SPF record it will no longer have the desired effect if your website is . So make sure that the SPF record will still cover all sending IP addresses before setting anything to .
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