Solved “Either there is no default mail client or the current mail client cannot fulfill the messaging request” when starting Microsoft Office Communicator 2007 R2

I got an error when starting Microsoft Office Communicator 2007 R2 on a Windows 2008 R2 machine with Microsoft Office 2010 installed: “Either there is no default mail client or the current mail client cannot fulfill the messaging request”.   Solution This error was resolved by installing the following update: …