The following TechNet articles discuss password changes for different service accounts:
MOSS
- Change passwords used for administration accounts
- Change passwords for SQL Server services
- Change passwords for Central Administration and Timer service
- Change passwords for the Search service
- Change passwords for the default access account
- Change passwords for Shared Services Providers
- Change passwords for Web application pools
- Change passwords for single sign-on
- Change passwords for profile import
WSS
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Certainement une des problématiques IT N°1 des forums MOSS : Comment changer les mots de passe des différentes