ALEXANDRIA, Va. & BOTHELL, Wash.--(BW HealthWire)--March 21, 2001-- Data Critical Corporation (Nasdaq:DCCA), a leader in wireless communication in health care and Metrocall, Inc. (Nasdaq: MCLLC), one of the largest wireless data and messaging companies in the U.S., today announced a licensing, distribution and technology integration agreement to provide wireless data services for physicians.

Under terms of the agreement, Metrocall will license and distribute Data Critical's unwiredDr wireless web services to Metrocall's 300,000-plus health care professional customers, as well as the entire medical community. Terms of the agreement include minimum distribution and marketing requirements for Metrocall and development obligations for Data Critical. In addition, Data Critical will become the exclusive provider of dictation services to Metrocall's medical customers.

Internet-based and configured for wireless access, the unwiredDr wireless web applications suite from Data Critical enables physicians to chart patient records, prescribe medications, dictate notes, check lab results and conduct other clinical paperwork via wireless devices such as WAP cell phones, two-way messaging units and browser-enabled personal data assistants. In particular, the service is ideal for small to medium-sized physician practices.

Through Metrocall, unwiredDr will be made available on Motorola's Timeport P935 two-way paging device using the ReFLEX 25 wireless platform. The Timeport P935 is one of the most advanced two-way devices on the market, combining e-mail, calendar, contacts, Web access and two-way messaging with high-resolution graphics in a compact, lightweight device. UnwiredDr services will be available as part of Metrocall's Timeport medical packages on a monthly subscription basis, per module or as an integrated package.

About Data Critical:

Data Critical Corporation develops and distributes wireless and Internet systems for communicating critical healthcare data. The company offers StatView™, AlarmView™ and FlexView™, a line of wireless alarm notification products for hospitals. It also provides MobileView™ and ECGStat™, a line of wireless products for physicians as well as WebChart™ and PocketChart™.

The company has twenty-five partnerships with such industry leaders as Aether Systems, Agilent Technologies, CRITIKON, General Electric, LabCorp, Medtronic, Siemens, and Welch Allyn. Additional information about Data Critical is available at www.datacritical.com.

About Metrocall, Inc.

Metrocall, Inc. headquartered in Alexandria, Virginia, is one of the largest wireless data and messaging companies in the United States providing both products and services to more than six million business and individual subscribers. Metrocall was founded in 1965, became a publicly traded company in 1993 and currently employs approximately 3,500 professionals coast to coast. The Company offers two-way interactive messaging, wireless e-mail and Internet connectivity, cellular and digital PCS phones, as well as one-way messaging services. Metrocall operates on many nationwide, regional and local networks, including a new Two-Way Interactive Network (TWIN), and can supply a wide variety of customizable Internet-based information content services. Also, Metrocall offers totally integrated resource management systems and communications solutions for business and campus environments. Metrocall's wireless networks operate in the top 1,000 markets all across the nation and the Company has offices and retail locations in more than forty states. Metrocall is the largest equity-owner of Inciscent, an independent business-to-business enterprise, that is a national full-service ``wired-to-wireless'' Application Service Provider (ASP). For more information on Metrocall please visit our Web site and On-line store at www.Metrocall.com.

This release may contain forward-looking statements that involve risks and uncertainties. Actual results may differ materially from the results predicted, and reported results should not be considered as an indication of future performance. Important factors, which could cause actual results to differ materially from those in the forward-looking statements, are detailed in filings with the Securities and Exchange Commission made from time to time by Data Critical Corporation, including its annual report on Form 10-K for fiscal year ended December 31, 1999. Data Critical Corporation undertakes no obligation to release publicly any revisions to any forward-looking statements to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events. Copies of Data Critical's public disclosure filings with the SEC are available from its investor relations department.

Data Critical Contact:

Laura Bridenback
425/482-7114
laurab@datacritical.com

or

Michael Singer
425/482-7000
msinger@datacritical.com