Word, Outlook and Lotus Notes

[SBE]

Hi I use both Outlook 2007 and Lotus Notes, Lotus Notes is my default mail
client.

When I start Word 2007 I get a message "Either there is no default mail
client or the current mail client cannot fulfill the messaging request.
Please run Microsoft Office Outlook and set it as the default mail client."
Word is then closing or hangs.

This was not a problem when I used Office 2003.

Thanks