How can we send many e-mails to many people by using word and excel for defiant data, e.x. salary slope?

check about mail merge.

I think it will help you 

1. Switch to the Mailings ribbon.
2. Click on the Finish & Merge menu and select the Send E-Mail Messages option.
3. From the To drop-down menu, select the field containing the email address of each recipient.
4. In the Subject text box, enter the subject line used for the email message.
5. From the Mail format drop-down menu, select the HTML option.
6. For the Send records radio button, select the All option.
7. Click on the OK button to send the messages.