General Requirements
Make sure that all web server extensions are set to FastCGI in IceWarp Administration Console - Web - Default - Scripting.
Upgrading MSSQL Setup
1. It is necesary to configure both instances of Microsoft Data Access (64-bit and 32-bit odbcad32.exe) with the same System DSN.
2. Navigate to Windows/SysWOW64 run odbcad32.exe and check your current System DSN settings.
3. Navigate to Windows/System32 run odbcad32.exe and set up exactly the same System DSN as the one above.
4. Run the upgrade process to 64-bit IceWarp Messaging Server.
5. Use IceWarp Administrator Console to test connection to all the databases (Accounts, Groupware, Antispam).
6. Log into WebClient to see if everything works correctly. Check Contacts (Groupware) and Blacklist & Whitelist (Antispam) functionality.
Upgrading MySQL Setup
1. Copy 64-bit libmysql.dll to Windows folder. Link to the 64-bit libmysql.dll (MySQL 5.5) is bellow.
2. Make sure there IS NOT 32-bit libmysql in Windows/System32.
3. Make sure there IS 32-bit libmysql.dll in Windows/SysWOW64. Link to the 32-bit libmysql.dll (MySQL 5.5) is bellow.
4. Run the upgrade process to 64-bit IceWarp Messaging Server.
5. Use IceWarp Administrator Console to test connection to all the databases (Accounts, Groupware, Antispam).
6. If you use MySQL also for WebClient cache and you are not able to log into IceWarp WebClient copy the 32-bit libmysql.dll also to folder IceWarp/PHP.
NOTE: If you experience some problems with LDAP module, please follow this thread:
http://forum.icewarp.com/forum/showthread.php?1834-10.4.5-x64-issues&p=5356#post5356