Here is a quick reference table for Exchange Admins of what's new or improved in successive versions of Exchange, from 2007 through 2013.
For a more general comparison, please visit here.
Exchange Server Roles
Cut down of Exchange Roles
No Edge – Included in SP1
Exchange Management Shell, EMC Console & Public Folder Management Console
No EMC – Exchange Admin Center
High Availability for Mailbox(LCR, SCR, CCR and SCC) and Hub server
Public Folder mailbox
In-place e-Discovery and In-place Hold. Integrated with Lync and SharePoint.
OWA with improved features (smart calendar scheduling, improved search, web ready document viewing)
Federation trust - Organization relationship - Sharing policies
OWA Offline Access and Apps.
DAG – Auto-reseed and Managed Store (Multiple store-exe process)
Transport Rules/ Connectors
e-Discovery and Litigation Hold
Mailbox move request
Data Loss policy and Policy tips
More transport rules
Load balancing CAS (No CAS array)
All clients connect through RPC-over-https – No MAPI connections
New Exchange Services
Accepted domain and email address policy
Address Book Policy
OWA mailbox policies
Manages certificates from EMC
Manage mobile devices from EMC
Reset virtual directories
Exchange Workload Management
Single Item recovery/Dumpster version 2.0
Exchange Control Panel
An excerpt from Radicati Group's latest study, "Microsoft Exchange, Office 365, and Outlook Market Analysis, 2013-2017" - Microsoft continues to be the leading vendor in the Email and Collaboration space with its Microsoft Exchange Server and Office 365 solutions. Combined, Microsoft Exchange Server and Microsoft Office 365 currently account for 51% of worldwide mailboxes in the Business Email and Collaboration market.
Cloud-based Business mailboxes offered through Microsoft Office 365 and Microsoft Hosting Partners currently account for 15% of worldwide Microsoft Exchange Server mailboxes, while On-Premises mailboxes still represent an 85% market share.
great comparison but to the average manager, what does all this mean??