Hi @daviddc
I've moved your comment over to its own discussion here as its unrelated to the changes with Google/Gmail security policy changes. (Only applies to the Reckon Accounts Business range software)
In relation to the error message you're receiving check out the info in the guide below -
Is Outlook set as your default mail program? You'll find that in the 'default apps' setting in Windows.
Also, is your Home & Business file name less than 8 characters in length? If not, I'd recommend doing this as well.
Give me a call and we can have a look and discuss your options.