My client wants to know if they move their website to dreamhost will their employees be able to access WEBMAIL and do name queries on contact lists? They also use a Microsoft's Outlook to run searches. Is there any interface issues with these app's?
If you change your hosting to dreamhost then you have to change your DNS.I think you company could work as like before....
Dreamhosts mail server is not Microsoft Exchange, which may be what your client has now.
You can host web services at dreamhost tho, and point your mx records somewhere else.