OWA and local caching

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Mike C - 13 Feb 2006 13:31 GMT

Is their a problem using OWA on a non-secure machine and opening attachments.
Will a copy of the document be placed in the temporary directory of the
drive on which the user is viewing his e-mail? Can other users using the pc
view the document?

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Mike C

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Henning Krause [MVP] - 13 Feb 2006 13:42 GMT

Hello,

that really depends on the browser.

Internet Explorer does have a setting called "Do not save encrypted pages to
disk". If that is checked, nothing should be saved to disk. However, this
settings seems to be disabled by default.

But if you are using OWA without HTTPS, there is no such protection.

I haven't checked this, but OWA might send an appropiate
Do-Not-Cache-instruction with its response to the client (via the HTTP
headers). But that really is just a hint for the browser... There might well
be some browsers which do not honor this hint.

Greetings,
Henning Krause

> Is their a problem using OWA on a non-secure machine and opening
> attachments.
> Will a copy of the document be placed in the temporary directory of the
> drive on which the user is viewing his e-mail? Can other users using the
> pc
> view the document?

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Lee Derbyshire - 13 Feb 2006 13:50 GMT

> Is their a problem using OWA on a non-secure machine and opening attachments.
> Will a copy of the document be placed in the temporary directory of the
> drive on which the user is viewing his e-mail? Can other users using the pc
> view the document?

Browsers tend to be over-keen when it comes to caching. If you are
concerned about this, have a look at this:

http://www.messageware.com/product_attachview.htm

Lee.

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