Exhibit 99.1

                CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

     In connection with the Annual Report on Form 10-K of MicroStrategy
Incorporated (the "Company") for the period ended December 31, 2002 as filed
with the Securities and Exchange Commission on the date hereof (the "Report"),
the undersigned, the Chief Executive Officer of the Company and the Chief
Financial Officer of the Company, each hereby certifies, pursuant to 18 U.S.C.
Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of
2002, that to his knowledge on the date hereof:

     (1)  the Report 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 Report fairly presents, in all
material respects, the financial condition and results of operations of the
Company.

Dated: March 13, 2003              /s/ Michael J. Saylor
                                  ---------------------------------------
                                  Michael J. Saylor
                                  Chairman of the Board of Directors
                                  and Chief Executive Officer

Dated: March 13, 2003              /s/ Eric F. Brown
                                  ---------------------------------------
                                  Eric F. Brown
                                  President and Chief Financial Officer