Assume that your mailbox language is set to German on a Microsoft Exchange Server 2007 server that has the mailbox server role installed. In this situation, the Microsoft Full-Text Engine Filter Daemon (Msftefd.exe) process constantly consumes up to 100 percent of CPU resources. This behavior may affect client access and message delivery.
This issue occurs because the German word breaker and stemmer driver (Nls400.dll) loaded by the Msftefd.exe process of the Exchange search engine consumes excessive CPU resources. This issue occurs when the Nls400.dll driver performs linguistic analysis on a changed or on a new message size of several megabytes before the message is indexed.
To resolve this issue, install the following update rollup:
2602324 Description of Update Rollup 5 for Exchange Server 2007 Service Pack 3
To work around this issue, disable the Microsoft Exchange Search Indexer service and the Microsoft Search (Exchange) service on the Exchange Server 2007 server.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about how to change the language for a mailbox, visit the following Microsoft website: