I purchased your quotation solution a few months back and have been really impressed with this system. It has made a huge difference to our business.
I am now looking to computerise the sales and invoicing process. I was wondering if you currently have an invoicing system on offer at the moment?
可以開發系統幫到客戶，的確是件開心的事．能獲得客戶讚賞，再購買其他系統，就更令人鼓舞．