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Because Excel automatically enables all macros in all workbooks that are stored in trusted locations, they become kind of loopholes in your security system, vulnerable to macro viruses and hacking attacks.

Therefore, in Microsoft Excel, all macros are disabled by default.

This tutorial covers different ways to enable macros in Excel and explains potential risks associated with that.

A malicious macro that you run unwittingly may damage or completely delete files on your hard drive, mess up your data, and even corrupt your Microsoft Office installation.

For this reason, Excels default setting is to disable all macros with notification.

This will turn on the macros and make the file a trusted document.

The next time you open the workbook, the security warning wont appear.

Any attempt to run a macro will result in the following message.

For examples, files opened from an unsafe location such as the Temp Folder, or if the system administrator has set the security policy in your organization to disable all macros without notification.

In such cases, the macros are only enabled for a single time.

On the next opening of the file, Excel will prompt you to enable the content again.

To avoid this, you can change your Trust Center settings or save the file to a trusted location.

When you open such a file, the security warning will show up.

You will still be able to turn on macros on opening a workbook, but only for the current session.

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For example, when you received an Excel file with VBA code that youd like to investigate, but you do not wish to make this file a trusted document.

When you close the workbook, and then reopen it, the warning will appear again.

You wont be able to run any macros except the ones stored in trusted locations.

Macros digitally signed with a special certificate by a trusted publisher are allowed to run.

If you have not trusted the publisher, Excel will prompt you to trust the publisher and enable the macro.

Its disabled by default to prevent unauthorized programs from changing your macros or building self-replicating harmful codes.

Any Excel file in a trusted location opens with macros enabled and without security warnings, even if the Disable all macros without notification option is selected in the Trust Center settings.

This lets you run macros in certain workbooks when all other Excel macros are disabled.

These locations are important for the correct work of Excel add-ins, macros and templates, and should not be changed.

Technically, you can save your workbook to one of the Excel default locations, but its better to create your own one.

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