When running or installing Web Suite application on a server box that has Exchange 2007 SP3 or SBS 2008 running on it, Web Suite fails to run or return "Admin Options" page right after the installation is completed. It gives an error:
HTTP Error 503 - Service is Unavailable
To resolve this issue, please try the following:
For exppw.dll file, we need to add condition that it only works for 64-bit application and should not be loaded for 32-bit app. To do so we have to:
1. Open %windir%\System32\inetsrv\config\applicationHost.config file in Notepad.
2. Search for name="exppw" tag; it is at more than one place. Modify the tag as shown below:
add name="exppw" /
3. And add the preCondition="bitness64" like this:
add name="exppw" preCondition="bitness64" /
4. After this, perform an IISreset.