Updating Links
The purpose of a link is to avoid duplicating formulas and data in multiple worksheets. If one workbook contains the information you need, you can use a link to reference the data without recreating it in another workbook.
To be useful, however, the data in the dependent workbook should always reflect what actually is in the source workbook. You can make sure of this by updating the link, as explained here:
* If both the source and the dependent workbooks are open, Excel automatically updates the link whenever the data in the source file changes.
* If the source workbook is open when you open the dependent workbook, Excel automatically updates the links again.
* If the source workbook is closed when you open the dependent workbook, Excel displays a Security Warning in the message bar, which tells you automatic updating of links has been disabled. In this case, click Options, click the Enable this Content option, and then click OK.
TIP
If you always trust the links in your workbooks (that is, you never deal with third-party workbooks or any other workbooks from sources you don't completely trust), you can configure Excel to always update links automatically. To begin, choose Office, Excel Options, click Trust Center, and then click Trust Center Settings. In the Trust Center dialog box, click External Content and then click to activate the Enable Automatic Update for All Workbook Links option. Click OK and then click OK again.
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