Excel: Sum Value of Same Cell Across Multiple Sheets

Heres a tip how to sum value of the same cell across multiple worksheets:

=SUM(Sheet1:Sheet3!B3)

This sums cell B3 from Sheet1, Sheet 2 and Sheet 3 - voilá!

European Spreadsheet Risks Interest Group (Excel Horror Stories)

Scary Excel Horror Stories here.

Excel VBA: Create Masked Password Dialog

Want to make a masked password dialog for your workbook?

Check this tip from Microsoft.

How to Round Numbers in Excel

Chandoo posted a thorough article on tips to rounding numbers using Excel.

Outlook: Week Numbers Lost and Setting Disabled for Good (Unable to Change)

 

I'm a big fan of week numbers. I've always had the week number visible as it's how things often are scheduled.

The pics at the right demonstrate how Outlook shows the week numbers when they are set visible.

However, a while ago the week numbers mystically went missing. Instead of the week number the month view showed date range (pic at the right) - which is useless for me, at least.

I jumped to Outlook'sOptions -> Calendar, as I know that's where the checkbox is. For my surprise the setting "Show week numbers in the month view and in the Date Navigator" was unchecked and the the setting was completely disabled - I couldn't change it.

As an end user, I didn't have much options to dig into this (from server rule-perspective for example) but with some help and try-error method found out that removing and adding my account again solved the issue. The setting is now checked (week numbers visible) but the box is disabled - i.e. can't be modified.

Why were the week numbers lost? I'm not sure, but I think the updates I installed a few days earlier - or some corporate server rules - are to blame.

Have you experienced the same issue, and/or any idea on the root-cause?

Also, I'm curious on what is the reasoning to completely disable the user to change a purely visual setting as the week number? :) Shouldn't at least have anything to do with security.

Improving Excel 2010 Performance

Since Excel 2007 we've had the "Big Grid" available - meaning over 1000 times the amount of cells than in older Excel versions.

This brings challenges in keeping the performance good while amount of data and formulas increase.

Read Microsoft's article Excel 2010 Performance: Improving Calculation Performance to get a better understanding of the calculation logic and how to improve you workbooks performance.

Office Next: The New Office Web Apps

The new Office Web Apps http://