A client poses a query I can't answer. He uses Excel 2007. He is proposing to use the 123 Sheets Bridging software for his next VAT Return. Before he finally registers with HMRC (and disables the old VAT portal - thereby burning his boats of course), he is 'practising' with the 123sheets VAT Return template. Apparently when he attempts to save his (practice) worksheet (using the 'save as' function) he is consistently getting a pop-up called the 'Microsoft Excel Compatability Checker'. He can still save the worksheet but is worried whether the appearance of this pop-up will compromise his subsequent ability to upload the worksheet and submit it. To be honest - I have no idea. Any thoughts?