The merger of Thomson and Reuters was completed last Thursday, you can read the press release from the newly formed Thomson Reuters; the Minneapolis-St. Paul Star Tribune has an article about what the merger may mean for Minnesota (West is headquartered in Eagen, Minnesota, in the Twin Cities area).
Also check out the new Thomson Reuters website - click on "Learn More" to see the nifty little Flash video marketing the new Thomson Reuters. "The end of Think. The beginning of Know. Thomson Reuters. Knowledge to Act."
In a more practical vein, everyone's email at West has changed from @thomson.com to @thomsonreuters.com . But the email sent to thomson.com will be forwarded to the new mailboxes indefinitely, so it shouldn't cause any sort of communications gap.