QUESTION Every time I launch Microsoft Outlook 2010 on my new Microsoft Windows 7 PC I get an error message reporting an invalid Office add-in. I've tried to accept the option to delete the add-in, but the error message still appears. The errors don't actually seem to affect the functionality of Outlook 2010, but it would be nice to get rid of them. Robin Sharpe
HELPROOM ANSWER The error message 'Outlook Synchronization is not a valid Office add-in' has a myriad of different causes and solutions. To even begin to scrape the top off the stack, we'd need to publish page after page just on this issue. However, if you're confident that you aren't running any conflicting software and all appears to be well, open Outlook, go to File, Options, Advanced, Developers, then turn off the option to 'Show add-in user interface errors'. This should remove the annoying message in future.