I've maintained an Exchange 2003 Server here for nearly 5 years in a low tolerance environment very successfully (in my opinion). I support about 65 accounts - some of which are tied into various web sites, others which are forwarded etc. etc. To clarify, this is a non-technical, non-profit where few understand how/why NDRs, SPAM, blacklists, or Blackberry Email problems occur - ever. Typically when these things happen, confidence in the local Exchange server drops regardless of the above or whether problems originate at distant ends. As a result of a handful of these issues (and I do mean a handful), a decision is being made to outsource email. An outside consultant I commissioned (since I didn't want to have a hand in the next "solution" since there will be problems with any email system as you know) has recommend Google Mail. I'm not versed in Google Mail as a corporate email solution or the particular Google Mail flavor the consultant is suggesting (below) but your opinions would be of great value and use. I'll spread points around gernerously. Thanks.
PS - to me, the "Easy Reading Quick Reference Guide" doesn't describe "google Mail server vs. Outlook"... Plus the very fact that the consultant mentions comparison between a mail server and an email client scares me...
Here is some info about google apps. Easy reading quick reference guide (#4) describes the google mail server vs. outlook.
1) Access to my data, and do I still own it? “Google is a data processor, not a data controller. The customer still owns the data. Additionally, the customer can access their data without use of the Google UI, if desired.”
This link may be helpful - http://www.dataliberation.org/
2) Google security answers - http://www.youtube.com/watch?v=sU6scRn_L-I
3) Light overview of some Google Apps in practical use - http://www.youtube.com/watch?v=M_TzCpYGpzw
4) Easy reading Quick Reference Guides - http://deployment.googleapps.com/Home/resources-user-adoption/quick-reference