. . . . . . . . . . . . . . 334
Identifying Existing LCS 2005 Server Roles . . . . . . . . . . . . . . . . . . . . . . . 335
Mapping the Path of Communications between LCS 2005 Servers . . . . . . . 337
Understanding User Distribution on Existing Servers . . . . . . . . . . . . . . . . . 338
Determining Your Ability to Update Client Software Packages . . . . . . . . . . 339
Designing Your New OCS 2007 Environment . . . . . . . . . . . . . . . . . . . . . . 340
Choosing a ???Big Bang??? Migration or a Phased
Migration to OCS 2007 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340
Upgrading Perimeter Servers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340
Preparing DNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341
Preparing Certifi cates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342
Exporting a Certifi cate from LCS 2005 . . . . . . . . . . . . . . . . . . . . . . . . 342
Importing a Certifi cate into OCS 2007 . . . . . . . . . . . . . . . . . . . . . . . . 344
Installing a New Certifi cate onto an OCS 2007 Edge Server . . . . . . . . . 345
Installing and Confi guring the Edge Server . . . . . . . . . . . . . . . . . . . . . . . . 347
Redirecting Internal LCS 2005 Servers through the New Edge Server . . . . 348
Redirecting Inbound Traffi c to the New Edge Server . . . . . . . . . . . . . . . . . 349
Upgrading Front-End Servers and Performing User Migration .
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