I have a head office which is running a live exchange server 2003. I have about 10 LAN users using Microsoft Outlook 2003, 2007 and 2010 for emails & their OS are either Windows XP Pro or Windows 7. I also have about 25 to 30 users in other offices who connect to the exchange server via POP3 to get emails (Oulook 2003,2007 & 2010). I use Mail Marshall for Spams.
We are planning to close down this office and move into a smaller place. My management would not want to bring along all the servers. My question is this. Can I opt for Office 365 which has a Exchange online? I am confused with the articles I read and how I should move along. If I use Office 365, I know I will get the office applications along with business class email and 50 GB storage space and sky drive etc. Does that imply I can just get rid of my active directory etc, and apply for Office 365 and create new users and email addresses there? Also will I be able to create mailing groups like how we can for exchange? My leased line required to host a exchanger server is about 1100 USD per month. Will using Office 365 be cheaper than hosting it live in the new place? Also if I opt for Office 365, will I have to upgrade all users to Windows 7?