Recently had a local shop load Office 2007. When I use Outook and Word the dictionary is clearly French.

How can I switch to English?

If you refer back to the thread where you last asked the question (http://www.pprune.org/computer-internet-issues-troubleshooting/379739-word-spellchecker-dictionary.html) you will find I gave you the answer (outlook uses the settings from word unless explicitly set to custom under tools/options/spelling).