Section 906 Certifications
I, Charles E. Porter, a Principal Executive Officer of the Funds listed on Attachment A, certify that, to my knowledge:
1. The form N-CSR of the Funds listed on Attachment A for the period ended January 31, 2006 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
2. The information contained in the Form N-CSR of the Funds listed on Attachment A for the period ended January 31, 2006 fairly presents, in all material respects, the financial condition and results of operations of the Funds listed on Attachment A.
| Date: March 29, 2006 /s/ Charles E. Porter ______________________ Charles E. Porter Principal Executive Officer |
Section 906 Certifications
I, Steven D. Krichmar, a Principal Financial Officer of the Funds listed on Attachment A, certify that, to my knowledge:
1. The form N-CSR of the Funds listed on Attachment A for the period ended January 31, 2006 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
2. The information contained in the Form N-CSR of the Funds listed on Attachment A for the period ended January 31, 2006 fairly presents, in all material respects, the financial condition and results of operations of the Funds listed on Attachment A.
| Date: March 29, 2006 /s/ Steven D. Krichmar ______________________ Steven D. Krichmar Principal Financial Officer |
| Attachment A N-CSR Period (s) ended January 31, 2006 |
| 073 | Putnam Premier Income Trust |
| 2AQ | Putnam Research Fund |
| 003 | Putnam Investors Fund |
| 007 | Putnam Voyager Fund |
| 006 | Putnam Vista Fund |
| 036 | Putnam Tax Free High Yield Fund |
| 035 | Putnam AMT-Free Insured Municipal Fund |
| 024 | Putnam OTC & Emerging Growth Fund |
| 2AP | Putnam Growth Opportunities Fund |
| 001 | The George Putnam Fund of Boston |
| Putnam RetirementReady Funds | |||
| 7CR | Putnam RetirementReady --2050 | ||
| 40M | Putnam RetirementReady --2045 | ||
| 40F | Putnam RetirementReady --2040 | ||
| 49Y | Putnam RetirementReady --2035 | ||
| 49R | Putnam RetirementReady --2030 | ||
| 49K | Putnam RetirementReady --2025 | ||
| 49D | Putnam RetirementReady --2020 | ||
| 48W | Putnam RetirementReady --2015 | ||
| 48I | Putnam RetirementReady --2010 | ||
| 48P | Putnam RetirementReady --Maturity Fund | ||