Install PEAR Mail on Windows Server 2008R IIS7 PHP

This article assumes that you already have PHP installed and working and your PHP location is C:\PHP

• Download go-pear.phar file from https://pear.php.net/go-pear.phar and save it as C:\PHP\PEAR\go-pear.phar 
• Open command prompt, navigate (cd) to C:\PHP\PEAR and run: php go-pear.phar
• Accept all installation defaults:
  1. Install Type: System-Wide
  2. Default paths: Yes (double check that path to your PHP install is correct)
  3. Update php.ini: Yes
     
     
     Read more: Install PEAR Mail on Windows Server 2008R IIS7 PHP

Installing PHP for IIS 7 on Windows Server 2008R2

• Download non-thread based PHP 7 from windows.php.net. (I used version php-7.1.5-nts-Win32-VC14-x64)
• Extract all files to C:\PHP
• Rename php.ini-production to php.ini and make following changes:
  • Uncomment and set: cgi.force_redirect = 0
  • Uncomment and set: fastcgi.impersonate = 1
  • Uncomment and set: extension_dir = "ext"
• Add ;C:\PHP to Windows Environment PATH Variable: Control Panel > System > Advanced System Settings > Environment Variables > System Variables > Path
  
• Try running php.exe -v from command prompt. You should get something like this:
  
  
  • If you get error (in the command prompt) "php.exe is not recognized as an internal or external command, operable program or batch file." - make sure C:\PHP PATH System variable was entered correctly and restart the server.
  • If you get Windows pop-up prompt with error "php.exe - The program can't start because VCRUNTIME140.dll is missing from your computer. Try reinstalling the program to fix this problem." - Download and install Microsoft Visual C++ 2015 Redistributable (x64).
    
    
    Read more: Installing PHP for IIS 7 on Windows Server 2008R2

Exchange / Outlook - There is a problem with the proxy server's security certificate

Issue

After replacing a wildcard SSL certificate (*.domain.com) with a basic single-server certificate (webmail.domain.com) remote clients using Microsoft Outlook can no longer connect to their email accounts on an Exchange server using HTTP Proxy Method. Outlook displays below error and then repeatedly prompts for a password:

There is a problem with the proxy server's security certificate.
The name on the security certificate is invalid or does not match the name of the target site webmail.domain.com.
Outlook is unable to connect to the proxy Server. (Error Code 0)

Microsoft Exchange - Uninstall Anti-spam agents

If you don't use anti-spam feature on Microsoft Exchange server you can uninstall anti-spam agents completely:

• Open Exchange Management Shell
• Navigate to C:\Program Files\Microsoft\Exchange Server\Scripts
• Run .\uninstall-AntispamAgents.ps1 cmdlet
• Confirm uninstall for each agent
  
  
  Read more: Microsoft Exchange - Uninstall Anti-spam agents