Excel Function Warning

When you type  something in a cell after an = sign in Excel, a list of functions is shown.  Functions have an icon next to them. For some functions, the icon shows a Yellow triangle with an exclamation mark. That is the Excel Function Warning I am talking about.

No warning No Excel Function Warning                         Warning Excel Function Warning for STDEV function

What exactly is the Excel Function Warning?

It basically means: “Do not use this function. We have a new and more accurate function available now”.  If you use only newer versions of Excel, you should use the newer functions.

Standard Deviation

Here is an example. The older STDEV function now has two separate functions STDEV.S and STDEV.P – S means sample and P means population. The mathematical formula used behind the scenes by these functions is different. As mathematics advances further, the logic used also undergoes improvement. The newer functions utilize the latest algorithms to increase accuracy of your results.

Best practice

  • Notice if any of the your formulas have one or more Excel Function Warning icon.
  • Go to the help file of that function.
  • The newer, better or more appropriate function will be listed there.
  • Learn the new function(s). Understand what has changed and why.
  • Change these across your files to ensure more accurate results.
  • Use the new function when you create new workbooks.


Session in Vietnam on 22nd June @HCMC

This is a special announcement for readers in Vietnam. I am speaking at an event arranged by Softline. We are inviting CFO and CIO from the organizations to attend together. This way, it is much easier to explain the business as well as technical details of technology in a single session. For more information, please contact Ms. Ha Linh at softlineevent@skyaries.com  Tel: 0918 401 248 or (+848) 3899 2737 


See you there!

Resize Email Images in Outlook

Outlook now has a new feature to compress ALL attached images in one go. Use Insert – Attachments option to add images. BEFORE sending the mail, open the File menu. You will see the new option. Choose the Resize large images when I send this mail option. Now all images will be compressed by reducing their size to 1024X768 or smaller. Aspect ratio will not be disturbed.

DO NOT use this option if you want to retain original resolution. If the mail bounces because the other person(s) cannot receive such large emails, put the files on some cloud storage (OneDrive, Google Drive, Dropbox, etc.) and send a link.


This feature was released in May 2017. Depending upon the configuration decided by your Office 365 Administrator, you may receive this feature much later. You will get it instantly if you are on the Office Insider – Fast branch.