Section 906 Certifications
I, Charles E. Porter, the 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 July 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 July 31, 2006 fairly presents, in all material respects, the financial condition and results of operations of the Funds listed on Attachment A.
Date: September 26, 2006
/s/ Charles E. Porter
______________________
Charles E. Porter
Principal Executive Officer
Section 906 Certifications
I, Steven D. Krichmar, the 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 July 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 July 31, 2006 fairly presents, in all material respects, the financial condition and results of operations of the Funds listed on Attachment A.
Date: September 26, 2006
/s/ Steven D. Krichmar
______________________
Steven D. Krichmar
Principal Financial Officer
Attachment A
July 31, 2006
| 003 | Putnam Investors Fund |
| 007 | Putnam Voyager Fund |
| 073 | Putnam Premier Income Trust |
| 035 | Putnam AMT Free-Insured Municipal Fund |
| 2AQ | Putnam Research Fund |
| 2AP | Putnam Growth Opportunities Fund |
| 036 | Putnam Tax Free High Yield Fund |
| 001 | The George Putnam Fund of Boston |
| 006 | Putnam Vista Fund |
| 024 | Putnam OTC & Emerging Growth Fund |
| |
| |
| Putnam RetirementReady |
| |
| 48P | Putnam RetirementReady Maturity |
| 48I | Putnam RetirementReady 2010 |
| 48W | Putnam RetirementReady 2015 |
| 49D | Putnam RetirementReady 2020 |
| 49K | Putnam RetirementReady 2025 |
| 49R | Putnam RetirementReady 2030 |
| 49Y | Putnam RetirementReady 2035 |
| 40F | Putnam RetirementReady 2040 |
| 40M | Putnam RetirementReady 2045 |
| 7CR | Putnam RetirementReady 2050 |
