Exhibit 99.(a)(1)(N)


                                   ATTENTION:
                      MERCATOR SOFTWARE, INC. STOCKHOLDERS

We previously sent to you an Offer to Purchase and related materials, outlining
Ascential Software Corporation's tender offer to purchase your shares of
Mercator Software, Inc. common stock, par value $0.01 per share, for $3.00 per
share, in cash without interest thereon through its wholly owned subsidiary,
Greek Acquisition Corporation. As detailed in those materials, YOUR BOARD OF
DIRECTORS RECOMMENDS THAT YOU ACCEPT THIS OFFER AND TENDER YOUR SHARES.

Because many people may be taking vacation at this time of year, WE WANT TO
REMIND YOU THAT THE OFFER IS SCHEDULED TO EXPIRE ON 11:59 P.M., NEW YORK CITY
TIME MONDAY, SEPTEMBER 8, 2003 AND THAT WHILE WE RESERVE THE RIGHT TO DO SO, WE
ARE NOT OBLIGATED TO EXTEND THE OFFER OR TO PROVIDE A "SUBSEQUENT OFFERING
PERIOD." If we do extend the Offer we will publicly announce the extension by
issuing a press release to the Dow Jones News Service no later than 9:00 a.m.
New York City time, on the next business day following the scheduled expiration
date.

WE URGE YOU TO CONSIDER CAREFULLY THE SECTION ON PAGE (IV) OF THE OFFER ENTITLED
"IF I DECIDE NOT TO TENDER, HOW WILL THE OFFER AND THE MERGER AFFECT MY SHARES?"
The Offer to Purchase and related materials, including the Letter of
Transmittal, contain important information and we urge you to read them
carefully.

If you have any questions relating to the Offer or how to tender your shares,
please call the Information Agent, Innisfree M&A Incorporated toll-free at
888-750-5834 (banks and brokers call collect at 212-750-5833).

We appreciate your prompt attention to this matter.

GREEK ACQUISITION CORPORATION, a wholly-owned subsidiary of
ASCENTIAL SOFTWARE CORPORATION

August 21, 2003