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302 Chapter 5 • Managing the Client Access Server www.syngress.com Figure 5.53 Managing Mobile Devices in OWA 2007 Managing the Client Access Server • Chapter 5 303 Managing POP3/IMAP4 Like its predecessors, Exchange Server 2007 also supports the Post Offi ce Protocol version 3 (POP3) and Internet Message Access Protocol version 4 (IMAP4) clients; however, since these client protocols aren’t that popular anymore (especially now that we have Outlook Anywhere, a superb Web mail client and EAS), the POP3 and IMAP4 protocols are disabled by default. Both the POP3 and IMAP4 protocols have been rewritten from the ground up in managed code, and are no longer dependent on the IIS component. Instead, they run as a separate Windows Service. Because the Exchange Product group focused on rewriting the POP3 and IMAP4 protocols in managed code, and because of the general time pressure that lay over their heads during the development of the Exchange Server 2007 product, they unfortunately didn’t have time to build a GUI to administer these protocols. This means that you cannot use the Exchange Management Console to confi gure or manage the POP3 and IMAP4 protocols. Instead, this must be done using the respective cmdlets in the Exchange Management Shell. TIP To remove a mobile device partnership or remote wipe a mobile device using the Exchange Management Shell, you must use the Remove-ActiveSyncDevice and ClearActiveSyncDevice cmdlets, respectively. For further details on how to do this, type Get-Help Remove-ActiveSyncDevice and/or Get-Help ClearActiveSyncDevice in the Exchange Management Shell. NOTE If the Exchange Product group receives suffi cient feedback from customers requiring a GUI for managing the POP3 and IMAP4 protocols, we can expect one to be included in Exchange Server 2007 Service Pack 1. Other things worth noting about the POP3 and IMAP4 services in Exchange Server 2007 is that we are limited to only one POP3 or IMAP4 service per server, and the same SSL certifi cate must be used for all POP3 and IMAP4 connections to the respective Client Access Server. In addition, Public Folder access through an IMAP4 client is no longer supported. Also, bear in mind that IPSec isn’t supported when you have an ISA Server deployed between clients and the Exchange server. 304 Chapter 5 • Managing the Client Access Server Okay, enough focus on what’s missing with the POP3 and IMAP4 protocols. After all, there are a few new improvements. Support for TLS encryptions has been added, Kerberos authentication is now supported, and, fi nally, the search feature for both POP3 and IMAP4 clients has been heavily improved. Enabling the POP3 and IMAP4 Services As mentioned earlier, both the POP3 and IMAP4 services are disabled by default. If you decide to use one or both of these services, the fi rst thing you must do is enable them and set them to an Automatic service startup type using the Services MMC snap-in. You can do this by clicking Start | Run and typing Services.msc, which brings up the Services snap-in (shown in Figure 5.54). Figure 5.54 Starting the POP3 and IMAP4 Services in the Services Snap-in Then drill down and open the property page for Microsoft Exchange POP3, as shown in Figure 5.55. Select Automatic in the Startup type drop-down menu, and then click Start. Managing the Client Access Server • Chapter 5 305 Repeat these steps for the Microsoft Exchange IMAP4 service, if needed. Figure 5.55 Setting the Service to Automatic Startup NOTE You can also enable the POP3 and IMAP4 services using the Set-Service and Start-Service cmdlets in the Exchange Management Shell. To set the services to start automatically, use the Set-Service MSExchangePOP3 and Set-Service MSExchangeIMAP4 cmdlet options, respectively. Next, you can start the services by typing Start-Service MSExchangePOP3 and Start-Service MSExchangeIMAP4. 306 Chapter 5 • Managing the Client Access Server When you have enabled the POP3 or IMAP4 service, you can verify functionality by making a telnet call to the Client Access Server on port 110 or 143, respectively. To do so, open a Command Prompt window and type: Telnet <server> 110 or Telnet <server> 143, and press Enter. You will then get the POP3 or IMAP4 banner, as shown in Figure 5.56. Figure 5.56 Verifying the Service Is Running Confi guring the POP3 or IMAP4 Services In order to confi gure more specifi c settings for the POP3 or IMAP4 services, you must use the Set-PopSettings and Set-ImapSettings cmdlets. We won’t dive further into the parameters available with these commands, but instead will briefl y mention that you can confi gure features such as maximum connections, connection timeouts, banner to displayed, login method, and so on. To see a full list of each parameter available, as well as their descriptions, type either Get-Help Set-PopSettings or Get-Help Set-ImapSettings, depending on which service you want to confi gure further. Limiting Access to the POP3 and IMAP4 Service When the POP3 and IMAP4 services have been started, all mailbox-enabled users can access their mailbox using one of these two services. Since there might be situations where you want to lock down access to these two services to a specifi c set of users (for example, in a shared hosting environment), I thought it would be a good idea to show you how to set access these services on a per-user basis. To enable or disable access to POP3, use the following cmdlets: Set-CASMailbox <user mailbox> -ImapEnabled $true Set-CASMailbox <user mailbox> -ImapEnabled $false To enable or disable access to IMAP4, use the following cmdlets: Set-CASMailbox <user mailbox> -PopEnabled $true Set-CASMailbox <user mailbox> -PopEnabled $false . superb Web mail client and EAS), the POP3 and IMAP4 protocols are disabled by default. Both the POP3 and IMAP4 protocols have been rewritten from the ground up in managed code, and are no longer. now supported, and, fi nally, the search feature for both POP3 and IMAP4 clients has been heavily improved. Enabling the POP3 and IMAP4 Services As mentioned earlier, both the POP3 and IMAP4 services. POP3 and IMAP4 services using the Set-Service and Start-Service cmdlets in the Exchange Management Shell. To set the services to start automatically, use the Set-Service MSExchangePOP3 and Set-Service