Why is not always resolving to correct IP address?

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Why is not always resolving to correct IP address?

A quick run down of our setup. We have a private IP address that recently changed to We run a Windows 2003 SBS that handles our Exchange server. We use that same server to host Our website is hosted off site by a web hosting company. Our IP address changed about a month ago. The web hosting company setup a public DNS record for & everything was great.

Within the last week we are having some issues with resolving correctly. The problem seems intermittent. It is most noticeable for users with smart phones that get Exchange to their handset. When one of these phones isn???t able to talk with Exchange, I???ve found that in the web browser of the phone, navigating to results in a ???page cannot be displayed??? error, however navigating to does bring up our internal website.

I had a coworker call me at home last night needing into their email on their home PC and they couldn???t get into it by going to, so I sent them to & they got right in. When doing an nslookup on his machine, he reported to me that resolved to our old IP address.

About a week before we started having these problems, I changed the Lease duration on our DHCP server from unlimited to 8 days in an attempt to clean up our internal DNS entries. I also turned on ???scavenge stale resource records??? in the forward & reverse lookup zones the DNS server & set it to 7 days.

DNS is by no means my expertise, so if you can provide some direction on what I need to do to get things working again, I would really appreciate it. I have contacted our web hosting company & they don't seem to know what is wrong, I asked them to double check their public record to make sure it didn't change somehow, but haven't heard back yet.