Communicator 2007 R2 Release Version Numbers and Corresponding Patches

One of the most common checks that we do when troubleshooting Communicator client issues is to check whether or not you are running the latest version of Communicator client or not. A majority of the client issues that get reported are resolved by upgrading to the latest release/update of the communicator client. It is highly recommended to ensure that you have the most up-to-date version of your client before you contact Product Support.

To check the client version, navigate to "About Office Communicator" from within your client

The version number is usually on the Second line. (3.5.6907.225 in the screenshot below)

Another way to check the client version is to look at the client UCCP log and look at any of the outgoing messages. For example, look at the initial REGISTER sent from the client: 

05/30/2011|09:26:45.633 610:B0C INFO :: REGISTER sip:treyresearch.net SIP/2.0

Via: SIP/2.0/TLS 192.168.11.121:49306

Max-Forwards: 70

From: <sip:user7@treyresearch.net>;tag=580fd9f5d2;epid=6cfd0ed78d

To: <sip:user7@treyresearch.net>

Call-ID: 4e6ffcfc3bfa47ebb80aee523f7e6527

CSeq: 1 REGISTER

Contact: <sip:192.168.11.121:49306;transport=tls;ms-opaque=eb5b8485b1>;methods="INVITE, MESSAGE, INFO, OPTIONS, BYE, CANCEL, NOTIFY, ACK, REFER, BENOTIFY";proxy=replace;+sip.instance="<urn:uuid:8A8C06E0-166A-5CC2-8145-82F56C6CCF50>"

User-Agent: UCCAPI/3.5.6907.223 OC/3.5.6907.225 (Microsoft Office Communicator 2007 R2)

Supported: gruu-10, adhoclist, msrtc-event-categories

Supported: ms-forking

ms-keep-alive: UAC;hop-hop=yes

Event: registration

Content-Length: 0

Now that you have a number, how do you know which release is actually running on the client?
Each update (updates are cumulative, thus the acronym CU may also be used) that is released by Microsoft for Office Communicator has its own version number. You can find out the version number associated with an update by looking at the related KB article and noting the version of 'Communicator.exe' in the 'File Information' section near the very end of the article.

For a quick reference I have listed the versions, release month/year and a link to the KB article of all the updates released till date for Office Communicator 2007 R2 in the table below: