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Microsoft has release Service Pack 4 for Exchange Server 5.5. Thanks DosFreak.



Microsoft Exchange Server 5.5 Service Pack 4 (SP4) is a cumulative release that contains all of the updates to Exchange Server 5.5. To download this file from this Web site, follow these instructions:

Create a folder named SP4 on your local hard drive.
Download all of the compressed files listed in the tables below to the SP4 folder.
At the Microsoft Windows NT® command prompt, switch to the SP4 folder, type the name of a compressed file, and then press ENTER to display the self-extracting dialog box.
In the Unzip To Folder box of the self-extracting dialog box, type the location of the SP4 folder. Click the Unzip button. Once the self-extraction process is complete, click OK, and then click Close.
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