MS CRM Culture ID XXXXX (0xYYYY) is not a supported Culture
Here’s a common error you can get when you are using MS CRM Multi-Language Packs.

Since this is not experienced bay many users around the world the resolution for same is also not written in many places. Therefore I thought of publishing this in the blog even though I by myself didn’t find the resolution. Special Thanks to my CRM/BI Buddy Kevin Tan for sending the solution for same. Here’s what you do:
1. This error occurs when the language in the database is not installed in the Windows server on which MS CRM is installed or the in the client PCs used to access MS CRM.
2. According to Microsoft, “The list of cultures in the Windows API is slightly different from the list of cultures in the .NET Framework. For example, the neutral culture zh-CHT "Chinese (Traditional)" with culture identifier 0x7C04 is not available in the Windows API. If interoperability with Windows is required (for example, through the p/invoke mechanism), use a specific culture that is defined in the .NET Framework. This will ensure consistency with the equivalent Windows locale, which is identified with the same LCID.”
(More Info: http://msdn.microsoft.com/en-us/library/system.globalization.cultureinfo(v=VS.71).aspx)
3. In this case, the language Id in the database was 18441 (Singapore-English). This language is not found in Windows Server 2003-SP2.
4. To fix this take the following steps:
a.) Update the LocaleId column in the Organisationbase table to 1033 (English-US).
b.) Update the LocaleId column for all the users with the erroneous localeId with 1033 in the UserSettingBase table.
c.) Delete the organization in CRM from Deployment Manager.
d.) Import the organization again.