Microsoft Exchange Server 2010 SP3 was release 12 feb 2013 with Co-Existing Support of Exchange 2013.In addition to it has fixed all the issues which was reported with the previous Service Pack.
Some of the features and Functions are added in the Service pack which has follow
- Exchange 2013 Coexistence support
- Sent Items Management feature
- Windows Server 2012 Supports
Exchange 2013 Co-Existence
This feature introduced to migrate your Exchange Server from 2010 to 2013 in co-existence mode, But you cannot perform an Inplace upgrade you need to do transition from 2010 to 2013.
Sent Item Management Feature
The Sent Items Management feature is great feature from Exchange 2013 which can provides control over whether an item that is “sent as” you, or “on behalf of” you, is copied to your Sent Items folder and to the sender’s Sent Items folder as well.
Windows 2012 Support
Now we can deploy Exchange 2010 on windows 2012
You can find on technet