HI,
1. -Does CRM online and exchange on-premise integration possible and does the calendar synchronize, e.g, if i create a task in dynamics crm online, will it appear on the users outlook calendar?
Please visit this post: http://www.powerobjects.com/blog/2012/02/07/sending-meeting-requests-from-microsoft-dynamics-crm-2011/
2. -Is mass mailing possible in CRM online?
http://blogs.msdn.com/b/dynamicscrmonline/archive/2009/04/02/mass-email-options-in-microsoft-dynamics-crm-4-0.aspx
http://blogs.msdn.com/b/crm/archive/2010/02/10/microsoft-dynamics-crm-bulk-email-with-merge-fields-and-pics.aspx
3. -Is there possibility to send personalized email using crm online?
https://community.dynamics.com/crm/b/crmpowerobjects/archive/2012/09/17/personalize-bulk-email-with-crm-2011-information.aspx
Bye
Alessandro Graps