Exchange 2003 migration options
Looking for ideas as to where to go with this, I'm sat arguing with myself back and forth the pros and cons of each option.
Currently running Exchange 2003/Windows 2003 in house and using Outlook 2010 as the client for all staff and students. Database size is about 70Gb and hundreds of thousands of emails stored within it (not really been tidied up for about 9 years...) The whole thing works fine but it's all getting very close to EOL for comfort. Budget is available for a new server if required and Exchange and CALS are already covered under EES. No plans to change from Windows 7, Office 2010 on all PC's for the next 12 months.
As I see it, two options:-
Option 1, migrate the lot to a new Windows 2012, Exchange 2013 box and keep it all in-house
Option 2, migrate the lot to Office 365 for Education (plan A2?) for free using my existing EES licensing
Could I get some feedback from users who have gone down option 2 and hosted the lot in the cloud, what is performance like for users with say 5000 emails in their inbox, how reliable is the service from Microsoft, how is it backed up, how good are the anti-virus and spam filtering and can that be managed, how easy is the migration from W2K3 to cloud, how well does it seamlessly integrate into my existing AD etc.
If I'm honest, I'm leaning towards option 2 but I keep having nagging doubts it's still a bit early to be putting all these eggs in one outsourced basket.
Many thanks for any feedback, happy to provide more information if I've been a bit vague.