Poping up a message box in Excel 2010 onload

I would like to pop up a message box or dialog box in an Excel 2010 file stored on a network so that when a user  opens the file, it will draw their attention to  certain conditions. The message must work also in read-only mode so that anyone will get the message when more than 1 user opens the file.  Thanks
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Wayne Taylor (webtubbs)Commented:
Use the Workbook_Open event. Something like this...

Private Sub Workbook_Open()
    MsgBox "Your message here." & vbCrLf & "Use 'vbCrLf' to have multiple lines."
End Sub

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thao-nhiAuthor Commented:
added vb code as above, saved as macro-enabled workbook. Nothing happened when opening the file. What am I missing?
Wayne Taylor (webtubbs)Commented:
The code needs to go in the ThisWorkbook module.
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Michael FowlerSolutions ConsultantCommented:
It is also worth noting that macros need to be enabled for this to work
thao-nhiAuthor Commented:
running the code in vb is fine. it does not work when opening the file????
Michael FowlerSolutions ConsultantCommented:
Here is @Wayne's code placed into an example workbook.
thao-nhiAuthor Commented:
how to change the title "Microsoft Excel" in the title?
Michael FowlerSolutions ConsultantCommented:
The msgbox function has the following format

MsgBox(prompt[, buttons] [, title] [, helpfile, context])

So you could have a messagebox with the Information icon, OK button and a title with
MsgBox "Your message here", vbInformation + vbOKOnly, "Message Title"

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Here are some more examples

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thao-nhiAuthor Commented:
thank you all
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