Exhibit 31.1  CERTIFICATION UNDER SECTION 302 OF THE SARBANES-OXLEY
ACT OF 2002  I, Stephanie G. DiMarco,
certify that:  1.I have reviewed this annual report on Form 10-K
of Advent Software, Inc.;  2.Based on my knowledge, this report does
not contain any untrue statement of a material fact or omit to state a material
fact necessary to make the statements made, in light of the circumstances under
which such statements were made, not misleading with respect to the period
covered by this report;  3.Based on my knowledge, the financial
statements, and other financial information included in this report, fairly
present in all material respects the financial condition, results of operations
and cash flows of the registrant as of, and for, the periods presented in this
report;  4.I am responsible for establishing and
maintaining disclosure controls and procedures (as defined in Exchange Act Rules
13a-15(e) and 15d-15(e)) and internal control over financial reporting (as
defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the
registrant and have:  a)
  designed such
  disclosure controls and procedures, or caused such disclosure controls and
  procedures to be designed under our supervision, to ensure that material
  information relating to the registrant, including its consolidated
  subsidiaries, is made known to us by others within those entities,
  particularly during the period in which this report is being prepared;b)
  designed such internal
  control over financial reporting, or caused such internal control over
  financial reporting to be designed under our supervision, to provide
  reasonable assurance regarding the reliability of financial reporting and the
  preparation of financial statements for external reporting purposes in
  accordance with generally accepted accounting principles;c)
  evaluated the
  effectiveness of the registrants disclosure controls and procedures and
  presented in this report our conclusions about the effectiveness of the
  disclosure controls and procedures, as of the end of the period covered by
  this report based on such evaluation; andd)
  disclosed in this
  report any change in the registrants internal control over financial
  reporting that occurred during the registrants most recent fiscal quarter
  (the registrants fourth fiscal quarter in the case of an annual report) that
  has materially affected, or is reasonably likely to materially affect, the
  registrants internal control over financial reporting; and  5.I have disclosed, based on our most recent evaluation
of internal control over financial reporting, to the registrants auditors and
the audit committee of the registrants board of directors (or persons
performing the equivalent functions):  a)
  all significant
  deficiencies and material weaknesses in the design or operation of internal
  control over financial reporting which are reasonably likely to adversely
  affect the registrants ability to record, process, summarize and report
  financial information; andb)
  anyfraud, whether or not material, that
  involves management or other employees who have a significant role in the
  registrants internal control over financial reporting.  March 13, 2008/s/ Stephanie G.
  DiMarcoStephanie G. DiMarcoPrincipal Executive
  Officer and President, andPrincipal Financial
  Officer