This Exchange TechNet Wiki page lists the Outlook client versions supported by Exchange 2007, Exchange 2010 and Exchange Online (BPOS) respectively.




note Update
The Exchange Server supportability matrix in the Microsoft TechNet documentation has now been updated to included Outlook versions and the Exchange Server version they are supported against. You can find it here.

 

Exchange Server 2007

The following Outlook client versions are fully supported by Exchange server 2007. Please bear in mind though, there’s a difference between what is supported and what might be compatible with Exchange 2007.

All of the Outlook versions listed below have been thoroughly tested by the Exchange Product group:

  • Microsoft Office Outlook 2010 RTM and later
  • Microsoft Office Outlook 2007 RTM and later
  • Microsoft Office Outlook 2003 RTM and later
  • Microsoft Office Outlook 2002

Please note, while Exchange RTM has been tested, RTM builds for Exchange are no longer supported.  Per the Lifecycle Support Policy, only Exchange 2007 SP3 is supported at this time.  For additional details, see https://support.microsoft.com/en-us/lifecycle/search/default.aspx?alpha=Exchange%20Server%202007&Filter=FilterNO

Note:
When using Outlook 2003 or earlier to connect against an Exchange 2007 or 2010 organization, you must ensure a public folder database exists in the organization. This is because Outlook 2003 and earlier uses public folders to retrieve free/busy information and the offline address book (OAB). For more information see: Microsoft KB article: When you use Outlook with an Exchange 2007 mailbox, you cannot connect to Exchange 2007, and you receive an error message.

Exchange Server 2010

The following Outlook client versions are fully supported by Exchange server 2010. Please bear in mind there’s a difference between what is supported and what might be compatible with Exchange 2010.

All of the Outlook versions listed below have been thoroughly tested by the Exchange Product group:

 
  • Microsoft Office Outlook 2010 RTM and later
  • Microsoft Office Outlook 2007 RTM and later
  • Microsoft Office Outlook 2003 Service Pack 2 and later

Please note, while Exchange RTM has been tested, RTM builds for Exchange are no longer supported.  Per the Lifecycle Support Policy, only Exchange 2010 SP3 is supported at this time.  For additional details, see https://support.microsoft.com/en-us/lifecycle/search/default.aspx?alpha=Exchange%20Server%202010&Filter=FilterNO

Note:
When using Outlook 2003 or earlier to connect against an Exchange 2007 or 2010 organization, you must make sure a public folder database exist in the organization. This is because Outlook 2003 and earlier use public folders to retrieve free/busy information and the offline address book (OAB). For more information see: Microsoft KB article: When you use Outlook with an Exchange 2007 mailbox, you cannot connect to Exchange 2007, and you receive an error message.


In addition, you should be aware of the following issues and the resolution to each, when using Outlook 2003 to connect to an Exchange 2010 mailbox:
 
 
 
 
 
 
 

Exchange Server 2013

The following Outlook client versions are fully supported by Exchange server 2013. Please bear in mind there’s a difference between what is supported and what might be compatible with Exchange 2013. All of the Outlook versions listed below have been thoroughly tested by the Exchange Product group:

Please note, each CU for Exchange 2013 is only supported for a period of 3 months after the release of the next CU.  For example, if CU1 is released on 3/1 and CU2 is released on 6/1, CU1 support will end on 9/1. 

Reference links :

http://technet.microsoft.com/en-us/library/aa996719.aspx

http://blogs.technet.com/b/exchange/archive/2013/02/08/servicing-exchange-2013.aspx  

Exchange Online (BPOS)

The following Outlook client versions are fully supported by Exchange Online (BPOS). Please bear in mind there’s a difference between what is supported and what might be compatible with Exchange 2010.

All of the Outlook versions listed below have been thoroughly tested by the Exchange Product group:  

  • Microsoft Office Outlook 2010 RTM and later
  • Microsoft Office Outlook 2007 RTM and later
  • Microsoft Office Outlook 2003 Service Pack 2 and later (Free/busy and Offline Address Book support requires the Microsoft Exchange Online Connector for Office Outlook 2003 when using the non-dedicated Exchange Online solution) 

Note:

Exchange Online (BPOS) is based on Exchange Server 2007, but will be upgraded to Exchange 2010 later this calendar year (2010).

Exchange Online ( Office365) is already based in Exchange 2010.

See Also

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