asp.net mvc barcode reader FIGURE 12-27 Untrusted certi cate warning in OWA 2007 in Software

Make Quick Response Code in Software FIGURE 12-27 Untrusted certi cate warning in OWA 2007

FIGURE 12-27 Untrusted certi cate warning in OWA 2007
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Outlook Web Access 2007
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OWA 2007 also requires SSL by default This means that the user will have to use HTTPS and not HTTP to gain access to OWA If the user misses the S, the error message will read as follows: HTTP Error 4034 - Forbidden: SSL is required to view this resource
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There are several features that many administrators may not need to change, but may apply to specific situations
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We described the settings available on the Segmentation tab earlier in this chapter, as part of the Virtual Directory Properties dialog box A common question asked by administrators is how to restrict OWA, which is available to all mailbox-enabled users by default This is done through segmentation In Exchange 2003, OWA segmentation was managed mostly through Registry entries In Exchange 2007, it is managed through the Set-OWAVirtualDirectory cmdlet for the OWA server and the Set-CASMailbox cmdlet for the user The latter sets the necessary values in the msExchMailboxFolderSet attribute in the user object in Active Directory
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In situations where bandwidth throughput provides the bottleneck for OWA performance, increasing GZip compression can improve overall performance Additional resources are required on the server to compress the bits more before they go across the wire, so sufficient resources are needed on each end to accommodate an increase in compression By default, GZip compression is set to Low on all the virtual directories This value can be changed to Off, High, or Error using the EMS, as follows:
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>Set-OWAVirtualDirectory -identity "<Virtual_Directory_Name>" -GzipLevel <Off | Low | High | Error>
PART IV
Setting the default virtual directory GZip compression level to High on the Exchange server with the CAS role installed would be accomplished as follows:
>Set-OWAVirtualDirectory -identity "owa (Default Virtual Directory)" -GzipLevel High
Like most virtual directory changes, IIS needs to be restarted This is easily done with the following command:
>iisreset /noforce
Web Beacons
Web beacons are bits of HTML that require a call to a remote web server in order for the browser or e-mail client to fully render the content They are often in the form of 1 1 pixel gif files They may even hold hazardous code or specifically confirm the recipient e-mail
Part IV:
Exchange Recipients and Clients
address of the message in which they are embedded Web beacons may also be used in legitimate e-mail newsletters as well as ill-intentioned junk mail senders If an e-mail client is set to automatically retrieve HTML content that is not specifically intrinsic to the message, the remote server hosting the gif file can log the success rate or the overall exposure of the e-mail message Like its Outlook counterpart, OWA 2007 can block the application from polling remote servers for HTML content This setting is configured using the EMS as follows:
>Set-OWAVirtualDirectory -identity "<Virtual_Directory_Name>" FilterWebBeaconsAndHtmlForms <UserFilterChoice | ForceFilter | DisableFilter >
The FilterWebBeaconsAndHtmlForms parameter has several properties The UserFilterChoice offers the end user the option to block web beacons The ForceFilter option will block remote HTML calls regardless of what the client attempts And finally, DisableFilter stops the server from actively preventing remote web server access for HTML e-mail content A sample command granting users the option on the default virtual directory on the local Exchange server with the CAS role installed might look like the following:
>Set-OWAVirtualDirectory -identity "owa (Default Virtual Directory)" FilterWebBeaconsAndHtmlForms UserFilterChoice
Customizing OWA
Outlook Web Access in Exchange 2007 maintains its customizable interface through its Exchange 2007 rewrite It is a web application, after all There are a few places and mechanisms for customizing the user experience The logon, logoff, and language selection pages can be customized In addition, themes of varying complexity can be made available or enforced for the users
Logon and Logoff Screens
Both the logon and logoff screens are formed through the combination of gif files and Cascading Style Sheet (css) files The easiest way to customize the logon screen is through the simple manipulation of these files to accommodate different colors and fonts CSS files can control the presentation of web pages in many ways In customizing the logon and logoff screens, the primary attributes in logoncss that administrators might want to amend are the background color, the text color, and the color of the dividing lines in the page These can be changed to match corporate colors, for example The gif files will need to be changed or re-created in a graphic-editing application Here s a list of the set of files that form both the logon and logoff pages: logoncss lgnbotlgif lgnbotmgif lgnbotrgif lgnexlogogif lgnleftgif lgnrightgif lgntoplgif lgntopmgif lgntoprgif
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