WAN IP Address change for Exchange 2010 - certificate problems?

One of our customers has a new WAN connection being installed and we will now be routing email to their Ex2010 server via this new connection - so their Internet facing IP address will change. Is this likely to cause problems for clients accessing the server via Outlook Anywhere or via iPhone's etc - I am thinking we may have issues with SSL Cert etc - has anyone had any experience with this. I understand we need to make a change to the DNS A Records and MX and SPF - this is all fine but I dont want to have client access issues once the new connection comes online

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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
reduce your dns ttl to a lower level at the registrar level.. 1 hour or less across the board.  You will have an outage with clients using older ip addresses until the ttl expires and they refresh the cache and get the new ip address.  

Until the change-over you will get increased dns hits but this is unavoidable.. once the address has changed. now go to your registrar and change the ip address to point to the new wan address and you can increase the ttl to a reasonable time (1 day / 1 week) whichever works best for your environment..  The DNS name will not change just the network ip address.. it is like doing a physical move.. your address changes but your company name doesn't .. its just located at a different physical address (ip address).. Customers will still go to the old address and until they know the new address they will be lost.
Juan OcasioConnect With a Mentor Application DeveloperCommented:
You should be fine if you modify the A records and mX records for your authoritative DNS. Also if they are using a spam filtering service you'll have to do the same. The records should all exist with the old ISP IP address, you'll just have to change it to the new IP address. We did this when we went from USLec to Comcast Cable.
TrentSlaterAuthor Commented:
Thanks very much for the prompt replies. I have split points - good to have the peace of mind. I will get the TTL changed to 1 hr now so we are ready to go

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