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                                                                    EXHIBIT 10.3

                           ONYX SOFTWARE CORPORATION

                         STOCK OPTION LETTER AGREEMENT
                         -----------------------------

     Notice is hereby given of the following option grant (the "Option") to
purchase shares of Common Stock of Onyx Software Corporation ("Onyx").  The
Option is being made pursuant to Onyx's 1998 Stock Incentive Compensation Plan
(the "Plan"), a copy of which is attached and incorporated into this Agreement
by reference.  The details of the Option and the most important terms set forth
in the Plan are summarized below:

          Optionee:                 Brian Henry
          --------

          Date of Grant:            April 4, 2001
          -------------

          Vesting Initiation Date:  April 4, 2001
          -----------------------

          Exercise Price:           $3.03 per Share
          --------------

          Number of Option Shares:  50,000 Shares
          -----------------------

          Term of Option:           Ten Years
          --------------

          Type of Option:           Non-Qualified Stock Option
          --------------

Vesting Schedule: The Option shall vest and become exercisable 100% four years
after the Vesting Initiation Date.   Notwithstanding the foregoing, the Option
is subject to certain vesting acceleration provisions, the specifics of which
are detailed in the Employment Agreement executed between Onyx and you on March
14th, 2001, (the "Employment Agreement") and which is hereby incorporated by
reference.  The accelerated vesting of the Option pursuant to this Vesting
Schedule and the Employment Agreement shall not be adversely altered or rendered
null and void, without Optionee's express written consent, even if such
accelerated vesting would preclude a Corporate Transaction or other transaction
involving the Company from qualifying for financial accounting treatment of such
transaction as a pooling of interests under APB Opinion No. 16.

Exercise/Transferability: During your lifetime only you can exercise the option.
The option is not transferable except by will or the applicable laws of descent
and distribution. The Plan provides for the exercise of the option by a personal
representative of your estate or the beneficiary thereof following your death.

Termination: The option will terminate pursuant to the terms of the Plan, as
modified by the provisions of Section 12(d) of the Employment Agreement.

DATED:  April 4, 2001               ONYX SOFTWARE CORPORATION

                                    By:         /s/ Brent Frei
                                            -------------------------------
                                            Title:  Chief Executive Officer

Acceptance and Acknowledgment
-----------------------------

I hereby agree to be bound by all terms and conditions of the Option set forth
in the Plan and acknowledge receipt of a copy of this letter, including a copy
of the Plan.  I have read and understand the Plan, including the provisions of
Section 11.

                                    /s/ Brian C. Henry
                               -------------------------------------------------
                                    Signature

                                    Brian C. Henry
                               -------------------------------------------------
                                    Printed Name

                                    4/7/01
                               -------------------------------------------------
                                    Date<PAGE>
                                                                    EXHIBIT 10.4

                           ONYX SOFTWARE CORPORATION

                         STOCK OPTION LETTER AGREEMENT
                         -----------------------------

     Notice is hereby given of the following option grant (the "Option") to
purchase shares of Common Stock of Onyx Software Corporation ("Onyx").  The
Option is being made pursuant to Onyx's 1998 Stock Incentive Compensation Plan
(the "Plan"), a copy of which is attached and incorporated into this Agreement
by reference.  The details of the Option and the most important terms set forth
in the Plan are summarized below:

          Optionee:                 Brian Henry
          --------

          Date of Grant:            April 4, 2001
          -------------

          Vesting Initiation Date:  April 4, 2001
          -----------------------

          Exercise Price:           $3.03 per Share
          --------------

          Number of Option Shares:  50,000 Shares
          -----------------------

          Term of Option:           Ten Years
          --------------

          Type of Option:           Non-Qualified Stock Option
          --------------

Vesting Schedule: The Option shall vest and become exercisable 100% four years
after the Vesting Initiation Date.   Notwithstanding the foregoing, the Option
is subject to certain vesting acceleration provisions, the specifics of which
are detailed in the Employment Agreement executed between Onyx and you on March
14th, 2001, (the "Employment Agreement") and which is hereby incorporated by
reference.  The accelerated vesting of the Option pursuant to this Vesting
Schedule and the Employment Agreement shall not be adversely altered or rendered
null and void, without Optionee's express written consent, even if such
accelerated vesting would preclude a Corporate Transaction or other transaction
involving the Company from qualifying for financial accounting treatment of such
transaction as a pooling of interests under APB Opinion No. 16.

Exercise/Transferability: During your lifetime only you can exercise the option.
The option is not transferable except by will or the applicable laws of descent
and distribution. The Plan provides for the exercise of the option by a personal
representative of your estate or the beneficiary thereof following your death.

Termination: The option will terminate pursuant to the terms of the Plan, as
modified by the provisions of Section 12(d) of the Employment Agreement.

DATED:  April 4, 2001              ONYX SOFTWARE CORPORATION

                                    By:   /s/ Brent Frei
                                          -------------------------------
                                          Title:  Chief Executive Officer

Acceptance and Acknowledgment
-----------------------------

I hereby agree to be bound by all terms and conditions of the Option set forth
in the Plan and acknowledge receipt of a copy of this letter, including a copy
of the Plan.  I have read and understand the Plan, including the provisions of
Section 11.

                                    /s/ Brian C. Henry
                               -------------------------------------------------
                                    Signature

                                    Brian C. Henry
                               -------------------------------------------------
                                    Printed Name

                                    4/7/01
                               -------------------------------------------------
                                    Date<PAGE>

*Certain confidential information contained in this document, marked by
brackets, has been omitted and filed with the Securities and Exchange Commission
pursuant to Rule 406 of the Securities Act of 1933, as amended.

                                                                    EXHIBIT 10.1

Medtronic Physio-Control Corp.
11811 Willows Road NE
P.O. Box 97006
Redmond, WA 98073-9706
www.physiocontrol.com
www.medtronic.com

April 2, 2001

HAND DELIVERED

Michael Singer, Executive Vice President and CFO
Data Critical Corporation
19820 North Creek Parkway, Suite 100
Bothell, WA 98011

Dear Michael:

We continue to be excited about the future of our relationship with you.  This
letter outlines the terms to enhance our relationship and to provide the
opportunity for both parties to mutually enhance each other's businesses.

 .    MPC is highly interested in working with DCCA and VitalCom, following
     DCCA's acquisition of VitalCom, on a good faith basis to explore the
     possibility of developing synergistic products between and among
     DCCA/VitalCom/MPC. DCCA and MPC will devote appropriate resources (as
     determined by each of DCCA and MPC in their sole respective discretion) at
     their respective costs toward this effort.
 .    MPC will have the exclusive right to distribute DCCA's Boomerang Product
     for a period of one year after the release of the Product by DCCA. The
     Boomerang Product will constitute a "Product" within the definition of
     "Product" under our existing Distribution Agreement. Pricing for the
     Boomerang Product is attached as Schedule A.
 .    MPC will have the right to sell the new Boomerang Upgrade to current
     StatView customers (those customers who received StatView product prior to
     January 1, 2001) on an exclusive basis for a period of one year after the
     release of the Product by DCCA. The new Boomerang Upgrade will constitute a
     "Product" under our existing Distribution Agreement. Pricing for the
     Boomerang Upgrade is attached as Schedule A.
 .    DCCA will offer MPC ECG Stat on a non-exclusive basis on terms to be
     negotiated in good faith. We confirm that the NRE costs will be waived. The
     ECG Stat will constitute a "Product" within the definition of "Product"
     under our existing Distribution Agreement.
 .    MPC will purchase DCCA's uninstalled backlog at a transfer price equal to
     [*] beginning April 1, 2001. A schedule of the uninstalled backlog is
     attached as Schedule B. MPC will install the uninstalled backlog at our
     expense. MPC will be responsible for all future sales commissions
<PAGE>

     and those costs associated with the installation and training of this
     backlog. Payments on the transfer price will be net 30 days from the time
     of shipment by DCCA to MPC or to our customer. We acknowledge that you have
     down payments from certain of the customers. We will net these down
     payments against our payments to you.

All other terms and conditions of the Distribution Agreement will remain in full
force and effect.

Sincerely,
MEDTRONIC PHYSIO CONTROL CORP.

/s/ David W. Shelton

David W. Shelton
Executive Vice President

Accepted and Agreed to:
DATA CRITICAL CORPORATION

By:  /s/ Michael E. Singer
     Michael E. Singer
     Executive Vice President, Corporate Development

cf:  Richard Martin, Howard Baker, David Nordin
     Richard Earnest, Brad Harlow, Bob May
     Paul Nicholson

                                       2

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