>>>Check out the "Happy 10 Year Anniversary" card Michel created for us to sign!
>>>When everyone signs it he's going to send it off to Bill Gates and the Fox Gang!
>
>>Define "everyone" :)
>
>"Everyone" as in everyone who signs it. :)
>
>>Happy... mmm what, this is not a birthday. Wedding anniversary?
>
>Is marriage not a purchase of sorts?

There's no happiness where it is. This would rather be "ten years under this roof" - hopefully that would be at least neutral enough not to invoke wrong connotations.