Send E-Mail if cell contains certain value

I have got a spreadsheet with the following structure and many rows:

Column A: Last name
Column B: First name
Column C: Further information
Column D: Expiration date
Column E: Days remaining (Formula: today - expiration date)
.....
Column J: E-mail-address
Column K: E-mail content

Now I want an e-mail (reminder) to be sent to the e-mail-address in J3 if the value in E3 (remaining days) reaches a certain value (e.g. 90 days). This E-Mail should just contain the text of K3.
Equal process for all the single rows...

Ideally the mails should be sent automatically if the document gets opened and the certain value (e.g. 90 days) has been reached.

Many thanks in advance!

I just want an email to be sent, a reminder in the calendar is not necessary.

By the way I am using Outlook 2007 and Excel 2007.

Thank you for your answer, but the code is not working.

I pasted it in ThisWorkbook, enabled macros, saved it... but nothing happened
Or do I have to consider anything else to trigger the email?

I attached the spreadsheet with sample data.

Would be great if you could set this up

Thank you so much, that's what I was looking for!

Now I just got two further questions
1) Is it possible that the email pop-up just appears once and not anymore after the email was sent?
2) Can I insert several of these macros in one sheet? (for 180, 90, 60, 30, 0 days)

So my intention is that I get a pop-up every time a cell in the column "remaining days" reaches one of the limits 180, 90, 60, 30 and 0 days.
And if the email for the limit of 180 days was sent, the pop-up doesn't appear again before the limit of 90 days is reached.

Thanks in advance!