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However, larger organizations with fast Internet connections, complex firewall configurations that require application filtering, or high availability requirements might want to deploy ISA Server, Enterprise Edition, on multiple servers to meet their requirements.
The quote is the original sentence, why didn't the author use 'and/or' ? Isn't that the one that makes the most sense?
1. However, larger organizations with fast Internet connections, complex firewall configurations that require application filtering, and high availability requirements might want to deploy ISA Server, Enterprise Edition, on multiple servers to meet their requirements.

2. However, larger organizations with fast Internet connections, complex firewall configurations that require application filtering, and/or high availability requirements might want to deploy ISA Server, Enterprise Edition, on multiple servers to meet their requirements.
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This can be reduced to pure logic, thus:

Organizations with X or Y or Z might want ABC.
= An organization might want ABC if it has X or if it has Y, or if it has Z.

According to the text, having any single entity from the set X, Y, Z means that the organization might want ABC.
But if an organization has more than one of these, it obviously has one, which already means that it might want ABC. There is therefore no need to require or even consider two or three together in order to trigger the idea that the organization might want ABC. So the use of and or and/or is unnecessary, and perhaps might even be confusing to some readers.

CJ
For example, you can use HTTP filtering to block the use of a particular peer-to-peer file-sharing service for one set of users, but allow it for another set, or you can allow Internet users to use specific HTTP methods such as POST for one Web publishing rule, but deny the method on another Web publishing rule.
For the qoute above, why did the author use 'or'? With 'or', it's saying that I can use HTTP filtering for this or that but not both? How come the arthur didn't use 'and' ? or even better 'or/and' ?

1. For example, you can use HTTP filtering to block the use of a particular peer-to-peer file-sharing service for one set of users, but allow it for another set, and you can allow Internet users to use specific HTTP methods such as POST for one Web publishing rule, but deny the method on another Web publishing rule.

2. For example, you can use HTTP filtering to block the use of a particular peer-to-peer file-sharing service for one set of users, but allow it for another set, or/and you can allow Internet users to use specific HTTP methods such as POST for one Web publishing rule, but deny the method on another Web publishing rule.
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Only context can determine whether or includes or excludes the possibility of or both.

The usage of or in your example is similar to this one:

You can go to Boston on vacation or you can go to Philadelphia.

The question is, "Can you do both?"

The answer is, "Yes and no".

You can do both successively, but you can't do both simultaneously.
You can't be in both places at the same time.

Whenever you want to suggest choices like this, you use or, not and. There is no need to write and/or or or/and.

CJ
Thanks. That was a great exmaple. I have a much better understadning of that now.
Only context can determine whether or includes or excludes the possibility of or both .
1. Only context can determine whether or includes or excludes the possibility of or both . (Sorry, can you explain to me what you mean by or both ? Why is it italicized?)
Only context can determine whether or includes or excludes the possibility of or both .

This means:

1. X or Y can mean X or Y or both (X and Y). [includes the possibility of or both]
2. Also, X or Y can mean X or Y, but not both (X and Y). That is, only one of the two. [excludes the possibility of or both]
Think about the context to decide if 1. or 2. is the meaning. Nothing else can be used to decide.

(Most of the time, the second meaning is intended.)

CJ
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Whenever you want to suggest choices like this, you use or, not and. There is no need to write and/or or or/and.
But wow does the reader know if only one of the choices can be used or a combination of any of the choices can used?
How does the reader know?
By using his common sense!

CJ
When would I use 'and/or' ? Can you give me one or two examples? Thanks.
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