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External sharing can be used in a variety of scenarios such as working with customers, partners, boards of directors, and others outside of your organization. However, you should carefully consider if and where to enable external sharing and confirm that proper governance and audit controls are in place to ensure that sensitive information is not being shared inappropriately with people outside of your organization—similar to policies that may be in place today for e-mail, FTP sites, and extranets. You should also ensure that access requests and permissions are regularly reviewed (see Figure 11-10) to ensure that access is revoked when it is no longer required.

From

Cover of Essential SharePoint 2013, Second Edition

Note

External site access