http://<server>/exchange/pf/root.asp? obj=000000001A447390AA6611CD9BC800AA002FC45A0300746FC765786ED011902900AA00A71AE30000000000120000
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There is an another way to obtain the identifier of a folder. If the folder the you are linking to is an immediate subfolder of All Public Folders, you may need to use this Alternative Method.