-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, G1oKevBr5mAYHvRcqqMv7qguMlqFnGuHGVjI8iJ8Fi17BPpQyPYnSqwz31EwJ4Z5 6y2gKWEASszk6YKt1SjFAg== 0000773757-08-000004.txt : 20080103 0000773757-08-000004.hdr.sgml : 20080103 20080103160303 ACCESSION NUMBER: 0000773757-08-000004 CONFORMED SUBMISSION TYPE: 497 PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20080103 DATE AS OF CHANGE: 20080103 EFFECTIVENESS DATE: 20080103 FILER: COMPANY DATA: COMPANY CONFORMED NAME: COLUMBIA FUNDS SERIES TRUST CENTRAL INDEX KEY: 0001097519 IRS NUMBER: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 0331 FILING VALUES: FORM TYPE: 497 SEC ACT: 1933 Act SEC FILE NUMBER: 333-89661 FILM NUMBER: 08506507 BUSINESS ADDRESS: STREET 1: ONE FINANCIAL CENTER CITY: BOSTON STATE: MA ZIP: 02111 BUSINESS PHONE: 6174263750 MAIL ADDRESS: STREET 1: ONE FINANCIAL CENTER CITY: BOSTON STATE: MA ZIP: 02111 FORMER COMPANY: FORMER CONFORMED NAME: NATIONS FUNDS TRUST DATE OF NAME CHANGE: 19991022

0001097519 S000010823 Mortgage- and Asset-Backed Portfolio

C000030049 Mortgage- and Asset-Backed Portfolio

497 1 mabsfsup.txt MORTGAGE- AND ASSET-BACKED PORTFOLIO SUPP COLUMBIA FUNDS SERIES TRUST Mortgage- and Asset-Backed Portfolio (the "Portfolio") Supplement dated January 3, 2008 to the Prospectus dated August 1, 2007 Effective immediately, the last sentence of the first paragraph of the section of the prospectus entitled "Principal Investment Strategies" is revised as follows: Under normal circumstances, the Portfolio's dollar-weighted effective duration will be between one and six years. INT-47/139112-0108 January 3, 2008 -----END PRIVACY-ENHANCED MESSAGE-----