Ms dns not updating
Secondary processes and interactions depend on the support for technologies such as Unicode and WINS.
When a DNS client needs to look up a name used in a program, it queries DNS servers to resolve the name.
Note: Typically it takes about 15 minutes for DNS changes to take effect.
However, it can occasionally take longer for a change you've made to update across the Internet's DNS system.
Make sure you've created mailboxes in Office 365 for everyone who has email on your domain BEFORE you change the MX record.
What if you don't want to move email for everyone on your domain to Office 365?
You can take steps to pilot Office 365 with just a few email addresses instead.
DNS processes and interactions involve the communications between DNS clients and DNS servers during the resolution of DNS queries and dynamic update, and between DNS servers during name resolution and zone administration.
If you’re having trouble with mail flow or other issues after adding DNS records, see Troubleshoot issues after changing your domain name or DNS records.
Before you use your domain with Office 365, we have to make sure that you own it.
Your ability to log in to your account at your domain registrar and create the DNS record proves to Office 365 that you own the domain.
Now that you've added the record at your domain registrar's site, you'll go back to Office 365 and request Office 365 to look for the record.Each query message the client sends contains three pieces of information, specifying a question for the server to answer: For example, the name specified could be the FQDN for a computer, such as “host-a.example.”, and the query type specified to look for an address (A) RR by that name.