Shareholder Proxy Services

September 15, 2009

IMPORTANT MATTER

REG1
REG 2
REG 3
REG 4
REG 5
REG 6
REG 7

Re: Pioneer Municipal High Income Trust (NYSE: MHI)
Cusip: 723763108

Dear Shareholder:

Our firm has been retained by Pioneer Municipal High Income Trust to contact you regarding your investment in common shares of the Trust, as of record date July 9, 2009. We have attempted to contact you, but have yet to be successful.

Please contact us immediately at 1-800-232-1064 between the hours of 9:00 a.m. and 11:00 p.m., Eastern Standard Time.

Thank you in advance for your assistance with this matter.

Sincerely,

PFred Bonnell
Investor Relations Supervisor
Shareholder Services
The Altman Group

"tag id"

60 East 42nd Street, New York, New York 10165

Pioneer Municipal High I... (NYSE:MHI)
Historical Stock Chart
Von Jun 2024 bis Jul 2024 Click Here for more Pioneer Municipal High I... Charts.
Pioneer Municipal High I... (NYSE:MHI)
Historical Stock Chart
Von Jul 2023 bis Jul 2024 Click Here for more Pioneer Municipal High I... Charts.