1. Review Release “Notes for Exchange Server 2007 SP1”  (http://download.microsoft.com/download/5/e/6/5e672458-592a-44a2-b489-11cec19d3c82/RelNotes.htm) carefully before upgrade.

2.  On every server with HES module deployed, copy Microsoft.Exchange.*.dll files from C:\Program Files\Microsoft\Exchange Server\Bin (or another directory if Exchange is installed in non-default path) to C:\DotNetPanel\Server\bin (or another directory if DNP Server is installed in non-default path). Overwrite existing files. Here is the list of files to be copied:

- Microsoft.Exchange.Common.dll

- Microsoft.Exchange.Data.Directory.dll

- Microsoft.Exchange.Diagnostics.dll

- Microsoft.Exchange.Extensibility.Internal.dll

- Microsoft.Exchange.Net.dll

Here is example of simplest batch file for coping those dlls. It assumes that all paths are default. It may help you not to miss any dll need to be coplied.

xcopy "C:\Program Files\Microsoft\Exchange Server\Bin\Microsoft.Exchange.Common.dll" C:\DotNetPanel\Server\bin\ /yes
xcopy "C:\Program Files\Microsoft\Exchange Server\Bin\Microsoft.Exchange.Data.Directory.dll" C:\DotNetPanel\Server\bin /yes
xcopy "C:\Program Files\Microsoft\Exchange Server\Bin\Microsoft.Exchange.Data.dll" C:\DotNetPanel\Server\bin /yes
xcopy "C:\Program Files\Microsoft\Exchange Server\Bin\Microsoft.Exchange.Diagnostics.dll" C:\DotNetPanel\Server\bin /yes
xcopy "C:\Program Files\Microsoft\Exchange Server\Bin\Microsoft.Exchange.Extensibility.Internal.dll" C:\DotNetPanel\Server\bin /yes
xcopy "C:\Program Files\Microsoft\Exchange Server\Bin\Microsoft.Exchange.Net.dll"  C:\DotNetPanel\Server\bin /yes

Note that step 2 (Microsoft.Exchange.*.dll files coping) is needed only for DNP versions prior 2.3.0. DNP 2.3.0 uses native Exchange paths.