Protected View is a read-only mode in which most editing functions have been disabled. There are several reasons why a file opens in Protected View:
The file was opened from an Internet location When you encounter the message in Protected View that states This file originated from an Internet location and might be unsafe. Click for more details. this is because the file is being opened from the Internet. Files from the Internet can have viruses and other harmful content embedded in them. We recommend that you edit only the document, if you trust its contents. The following image is an example:
The file was received as an Outlook 2010 attachment and your computer policy has defined the sender as unsafe When you encounter the message in Protected View that states This file originated as an e-mail attachment and might be unsafe. Click for more details. this is because the file was received from a potentially unsafe sender. The following image is an example:
The file was opened from an unsafe location When you encounter the message in Protected View that states This file was opened from a potentially unsafe location. Click for more details. the file was opened from a folder that is unsafe. An example of an unsafe location is your Temporary Internet Files folder. The following image is an example:
The file is blocked by File Block .What is File Block? The following images are examples: