Homeland Secure IT, LLC can assist you with a move to (or from) Google Apps. We are a reseller of Google Apps and can help determine if using an “in the cloud” solution is right for you.
Some interesting news is that Google has made it (somewhat) easy to migrate from your current Microsoft Exchange system to their hosted solution. You can read more about that at InformationWeek http://www.informationweek.com/news/software/open_source/showArticle.jhtml?articleID=223900148
Some issues we are seeing are total mail blackouts due to internet connectivity interruptions, if this is a concern for you, then a hosted email solution is probably not going to work out for you, but give us a call and we will examine your needs and go over the pros and cons with you.
On the other hand, if you want to use a Microsoft Exchange server to host your own mail, we can assist with that too.