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news is that Microsoft supports the customization of the OWA login page and documents what needs to be done to accomplish this task in the Exchange 2010 help file. The most common customizations are applied to the OWA login pages to update the color scheme and logos to match corporate branding. TechNet contains a section dedicated to this topic that describes the names of the CSS and graphic files that OWA uses, how the components fit together to form the pages viewed by users, and how colors are assigned to the various text sections in the pages. Figure 10-22 shows a useful illustration from TechNet that shows the graphic files that OWA combines to present a customized log-in dialog box. You can use this information to develop the necessary customizations to comply with corporate branding.
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Figure 10-22 Components of OWA customization (source: TechNet).
An easy customization that you can accomplish in a couple of minutes is to add some text to the OWA log-in screen. This is commonly done to provide some guidance to users about how they should seek help in case of problems. Figure 10-23 shows how some text has been added for the contoso.com deployment and how it appears when a user logs into OWA.
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To customize the log-in screen with some new text, you do the following:
1. Create a file containing the HTML formatting instructions for the text that you
want to display. You can call the file anything you like as long as you store it in the \Program Files\Microsoft\Exchange Server\V14\Client Access Server\OWA\Auth directory. For the purpose of this explanation, let s call the file contoso-disclaimer.inc.
2. Copy the \Program Files\Microsoft\Exchange Server\V14\Client Access Server\OWA
\Auth\Logon.aspx file. This is the file that contains all the instructions used by OWA when it logs on a user.
3. Open the Logon.aspx file with a text editor and search for the string mid tblConn.
Right below it, insert a line to instruct OWA to read and display the text contained in the contoso-disclaimer.inc file that we created in step 1. The code in Logon.aspx will then look something like this:
<table class="mid tblConn"> <!-- #include file="contoso-disclaimer.inc" -->
4. Save Logon.aspx and restart an OWA session (you don t have to restart Microsoft
Internet Information Services [IIS] or any of the Exchange services). You should see your text displayed similar to Figure 10-23.
Figure 10-23 Updating the OWA log-in screen with some customized text.
5. The same approach can be taken to update Logoff.aspx if you want users to see a
customized message when they sign off from OWA.
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6. Once you are happy with the customization, you can apply it on all CAS servers by
copying your modified files. There is no automatic mechanism to apply this kind of customization on every CAS server in an organization.
INSIDE OUT
Customizations could be overwritten by future product updates
The other thing to remember is that any customization to one of the OWA components is a candidate to be overwritten by a new Microsoft version of the component in a new service pack, hot fix, or roll-up update . That s why you keep careful documentation about any customization that you apply to OWA to make it easier to apply it after you upgrade Exchange . You should also keep a copy of both the original and the customized versions of any file that you change so that you can review them in the future . It s also fair to say that there is no guarantee that Microsoft will not change the way that OWA works in a future version and render this method of customization or any method of customization invalid, so be prepared to build some time to test and perhaps do a little recoding for OWA customizations into every deployment plan .
OWA mailbox policies and feature segmentation
Exchange 2010 supports the ability to allocate different levels of functionality to OWA users through policies. Although Exchange 2010 includes a default OWA policy, it is not actually applied to mailboxes unless you explicitly select the mailbox and apply the policy to it. Otherwise access to OWA features is controlled by the segmentation properties defined for the OWA virtual directory on each CAS server (Figure 10-24). OWA mailbox policies didn t exist in Exchange 2007, and the only way that you could segment functionality was through the properties of the OWA Web site. The problem with this approach is that any change applies to all mailboxes that connect to that CAS. Using policies allows more granular control because you can apply different policies at the level of an individual mailbox. In addition to their ability to segment features presented through OWA, OWA mailbox policies control some of the user-controllable settings available through ECP.
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