Exhibit (a) (1) (iv)

Offer to Purchase for Cash All Outstanding Shares of Common Stock of

MAPINFO CORPORATION

at $20.25 Net Per Share by MAGELLAN ACQUISITION CORP.

a wholly-owned subsidiary of PITNEY BOWES INC.

March 22, 2007

To Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees:

Magellan Acquisition Corp., a Delaware corporation (the “Purchaser”) and a wholly-owned subsidiary of Pitney Bowes Inc., a Delaware corporation, is making an offer to purchase all outstanding shares of common stock, par value $0.002 per share, (the “Shares”) of MapInfo Corporation, a Delaware corporation, at $20.25 per Share in cash, without interest, less any required withholding and transfer taxes, upon the terms and subject to the conditions set forth in the Purchaser’s Offer to Purchase dated March 22, 2007, and the related Letter of Transmittal (which, together with any amendments or supplements thereto, collectively constitute the “Offer”).

For your information and for forwarding to your clients for whom you hold Shares registered in your name or in the name of your nominee, we are enclosing the following documents:

1. Offer to Purchase, dated March 22, 2007;

2. Letter of Transmittal, including a Substitute Form W-9, for your use and for the information of your clients;

3. Notice of Guaranteed Delivery to be used to accept the Offer if the Shares and all other required documents cannot be delivered to Mellon Investor Services LLC, the Depositary for the Offer, by the expiration of the Offer;

4. A form of letter which may be sent to your clients for whose accounts you hold Shares registered in your name or in the name of your nominee, with space provided for obtaining such clients’ instructions with regard to the Offer;

5. Guidelines for Certification of Taxpayer Identification Number on Substitute Form W-9 providing information relating to backup federal income tax withholding; and

6. Return envelope addressed to the Depositary.

WE URGE YOU TO CONTACT YOUR CLIENTS AS PROMPTLY AS POSSIBLE.

THE OFFER AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT, NEW YORK TIME, ON WEDNESDAY, APRIL 18, 2007, UNLESS THE OFFER IS EXTENDED AS DESCRIBED IN THE OFFER TO PURCHASE.

The Purchaser will not pay any fees or commissions to any broker, dealer or other person (other than the Information Agent or the Depositary as described in the Offer to Purchase) for soliciting tenders of Shares pursuant to the Offer. The Purchaser will, however, upon request, reimburse brokers, dealers, banks and trust companies for reasonable and necessary costs and expenses incurred by them in forwarding materials to their customers. The Purchaser will pay all stock transfer taxes applicable to its purchase of Shares pursuant to the Offer, subject to Instruction 6 of the Letter of Transmittal.

In order to accept the Offer a duly executed and properly completed Letter of Transmittal and any required signature guarantees, or an Agent’s Message (as defined in the Offer to Purchase) in connection with a book-entry delivery of Shares, and any other required documents, should be sent to the Depositary by 12:00 midnight, New York City time, on Wednesday, April 18, 2007.

Any inquiries you may have with respect to the Offer should be addressed to, and additional copies of the enclosed materials may be obtained from, the Information Agent or the undersigned at the addresses and telephone numbers set forth on the back cover of the Offer to Purchase.

Very truly yours,

PITNEY BOWES INC.

NOTHING CONTAINED HEREIN OR IN THE ENCLOSED DOCUMENTS SHALL CONSTITUTE YOU THE AGENT OF MAGELLAN ACQUISITION CORP., PITNEY BOWES INC., THE INFORMATION AGENT OR THE DEPOSITARY, OR AUTHORIZE YOU OR ANY OTHER PERSON TO USE ANY DOCUMENT OR MAKE ANY STATEMENT ON BEHALF OF ANY OF THEM IN CONNECTION WITH THE OFFER OTHER THAN THE DOCUMENTS ENCLOSED HEREWITH AND THE STATEMENTS CONTAINED THEREIN.