Microsoft (MSFT) DEFA14AAdditional proxy soliciting materials

Your Vote Counts! MICROSOFT CORPORATION 2023 Annual Meeting Vote by December 6, 2023 11:59 PM ET. For shares held in a Plan, vote by December 4, 2023 11:59 PM ET. C/O PROXY SERVICES P.O. BOX 9163 FARMINGDALE, NY 11735 V23332-P97702-Z85851 You invested in MICROSOFT CORPORATION and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the shareholder meeting to be held on December 7, 2023. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to November 23, 2023. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting* December 7, 2023 8:30 a.m. PT Virtually at: www.virtualshareholdermeeting.com/MSFT23 * Please check the meeting materials for any special requirements for meeting attendance. V1.1

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items Board Recommends 1. Election of Directors: (The Board recommends a vote FOR each nominee) Nominees: 01. Reid G. Hoffman 02. Hugh F. Johnston 03. Teri L. List 04. Catherine MacGregor 05. Mark A. L. Mason 06. Satya Nadella 07. Sandra E. Peterson 08. Penny S. Pritzker 09. Carlos A. Rodriguez 10. Charles W. Scharf 11. John W. Stanton 12. Emma N. Walmsley 2. Advisory Vote to Approve Named Executive Officer Compensation (“say-on-pay vote”) (The Board recommends a vote FOR this proposal) 3. Advisory Vote on the Frequency of Advisory Vote on Executive Compensation (The Board recommends a vote for 1 YEAR on this proposal) 4. Ratification of the Selection of Deloitte & Touche LLP as our Independent Auditor for Fiscal Year 2024 (The Board recommends a vote FOR this proposal) 5. Report on Gender-Based Compensation and Benefit Gaps (The Board recommends a vote AGAINST this proposal) 6. Report on Risk from Omitting Ideology in EEO Policy (The Board recommends a vote AGAINST this proposal) 7. Report on Government Takedown Requests (The Board recommends a vote AGAINST this proposal) 8. Report on Risks of Weapons Development (The Board recommends a vote AGAINST this proposal) 9. Report on Climate Risks to Retirement Plan Beneficiaries (The Board recommends a vote AGAINST this proposal) 10. Report on Tax Transparency (The Board recommends a vote AGAINST this proposal) 11. Report on Data Operations in Human Rights Hotspots (The Board recommends a vote AGAINST this proposal) 12. Mandate for Third-Party Political Reporting (The Board recommends a vote AGAINST this proposal) 13. Report on AI Misinformation and Disinformation (The Board recommends a vote AGAINST this proposal) For 1 Year Against Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. V23333-P97702-Z85851

BROADRIDGE FINANCIAL SOLUTIONS, INC. BROADRIDGE CORPORATE ISSUER SOLUTIONS PO BOX 1342T., SUITE 1300 BRENTWOOD, NY 11717 BROADRIDGE FINANCIAL SOLUTIONS, INC. ** 11 ATTENTION: TEST PRINT 51 MERCEDES WAY EDGEWOOD, NY 11717 VOTING INSTRUCTIONS As the record holder for your shares, we will vote your shares based on your instructions. Please provide us with your voting instructions before the meeting. If you do not provide us with your voting instructions, we may vote your shares at our discretion on those proposals we are permitted to vote on by New York Stock Exchange rules. If you sing and return this form, we will vote any unmarked items based on the board’s recommendations. If your securities are held by a bank, your securities cannot be voted without your specific instructions. MICROSOFT CORPORATION THIS IS A VOTING INSTRUCTION FORM. You are receiving this voting instruction form because you hold shares in the above security. You have the right to vote on proposals being presented at the upcoming Annual Meeting to be held on 12/07/23 at 08:30 A.M. PST Make your vote count. Vote must be received by 12/06/2023 to be counted. 0123 4567 8192 1239 Visit www.ProxyVote.com Call 1-800-454-8683 Return this form in the enclosed postage-paid envelop. Attend and vote at the meeting. Scan to view materials and vote via smartphone. Voting on www.ProxyVote.com is easy and fast! Go to www.ProxyVote.com, enter the control number above and vote! The following proxy materials for the meeting are available at www.ProxyVote.com: PROXY STATEMENT, ANNUAL REPORT THIS VOTING INSTRUCTION FORM IS VALID ONLY WHEN SIGNED AND DATED. PLEASE USE BLUE OR BLACK INK AND RETURN ONLY THE BOTTOM PORTION. MICROSOFT CORPORATION The Board recommends you vote FOR the following director nominee (s) : 1a through 1l For Against Abstain 1a. Election of Director: Reid G. Hoffman 1b. Election of Director: Hugh F. Johnston 1c. Election of Director: Teri L. List 1d. Election of Director: Catherine MacGregor 1e. Election of Director: Mark A. L. Mason 1f. Election of Director: Satya Nadella 1g. Election of Director: Sandra E. Peterson 1h. Election of Director: Penny S. Pritzker 1i. Election of Director: Carlos A. Rodriguez 1j. Election of Director: Charles W. Scharf 1k. Election of Director: John W. Stanton 1l. Election of Director: Emma N. Walmsley The Board recommends you vote For the following Proposal ( s ) : 2 For Against Abstain 2. Advisory Vote to Approve Named Executive Officer Compensation ( “say-on-pay vote”) The Board recommends you vote 1 YEAR on The following proposal : 3 1 year 2 years 3 years Abstain 3. Advisory Vote on the Frequency of Advisory Vote on Executive Compensation The Board recommends you vote For the following Proposal ( s ) : 4 4. Ratification of the Selection of Deloitte & Touche LLP as our Independent Auditor for Fiscal Year 2024. The Board recommends you vote AGAINST the following proposal ( s ) : 5 through 13 5. Report on Gender- Based Compensation and Benefit Gaps 6. Report on Risk from Omitting Ideology in EEO Policy 7. Report on Government Takedown Requests 8. Report on Risks of Weapons Development 9. Report on Climate Risks to Retirement Plan Beneficiaries 10. Report on Tax Transparency 0001614289_1 R1.0.0.6 U52025 12 Signature [PLEASE SIGN WITHIN BOX] Date CONTINUED ON THE REVERSE SIDE 0123 4567 8192 1239 12/07/23 123,456,789,012.00000 594918104 *****ACCOUNT P97209-01S GS2

PLEASE ENSURE YOU FOLD, THEN DETACH AND RETAIN THIS PORTION OF THE VOTING INSTRUCTION FORM. 11. Report on Data Operations in Human Rights Hotspots 12. Mandate for Third-Party Political Reporting 13. Report on AI Misinformation and Disinformation *NOTE* Such other business as may properly come before the meeting or any adjournment thereof. For Against Abstain 0001614289_2 R1.0.0.6

BROADRIDGE FINANCIAL SOLUTIONS, INC. BROADRIDGE CORPORATE ISSUER SOLUTIONS PO BOX 1342T., SUITE 1300 BRENTWOOD, NY 11717 IMPORTANT NOTICE REGARDING DELIVERY OF SECURITY HOLDER DOCUMENT (HH) BROADRIDGE FINANCIAL SOLUTIONS, INC. 22 1 OF 2 ATTENTION: TEST PRINT 51 MERCEDES WAY EDGEWOOD, NY 11717 VOTING INSTRUCTIONS As the record holder for your shares, we will vote your shares based on your instructions. Please provide us with your voting instructions before the meeting. If you do not provide us with your voting instructions, we may vote your shares at our discretion on those proposals we are permitted to vote on by New York Stock Exchange rules. If you sing and return this form, we will vote any unmarked items based on the board’s recommendations. If your securities are held by a bank, your securities cannot be voted without your specific instructions. MICROSOFT CORPORATION THIS IS A VOTING INSTRUCTION FORM. You are receiving this voting instruction form because you hold shares in the above security. You have the right to vote on proposals being presented at the upcoming Annual Meeting to be held on 12/07/23 at 08:30 A.M. PST Make your vote count. Vote must be received by 12/06/2023 to be counted. 0123 4567 8192 1239 Visit www.ProxyVote.com Call 1-800-454-8683 Return this form in the enclosed postage-paid envelop. Attend and vote at the meeting. Scan to view materials and vote via smartphone. Voting on www.ProxyVote.com is easy and fast! Go to www.ProxyVote.com, enter the control number above and vote! The following proxy materials for the meeting are available at www.ProxyVote.com: PROXY STATEMENT, ANNUAL REPORT PAGE 1 OF 2 THIS VOTING INSTRUCTION FORM IS VALID ONLY WHEN SIGNED AND DATED. PLEASE USE BLUE OR BLACK INK AND RETURN ONLY THE BOTTOM PORTION. MICROSOFT CORPORATION The Board recommends you vote FOR the following director nominee (s) : 1a through 1l For Against Abstain 1a. Election of Director: Reid G. Hoffman 1b. Election of Director: Hugh F. Johnston 1c. Election of Director: Teri L. List 1d. Election of Director: Catherine MacGregor 1e. Election of Director: Mark A. L. Mason 1f. Election of Director: Satya Nadella 1g. Election of Director: Sandra E. Peterson 1h. Election of Director: Penny S. Pritzker 1i. Election of Director: Carlos A. Rodriguez 1j. Election of Director: Charles W. Scharf 1k. Election of Director: John W. Stanton 1l. Election of Director: Emma N. Walmsley The Board recommends you vote For the following Proposal ( s ) : 2 For Against Abstain 2. Advisory Vote to Approve Named Executive Officer Compensation ( “say-on-pay vote”) The Board recommends you vote 1 YEAR on The following proposal : 3 1 year 2 years 3 years Abstain 3. Advisory Vote on the Frequency of Advisory Vote on Executive Compensation The Board recommends you vote For the following Proposal ( s ) : 4 4. Ratification of the Selection of Deloitte & Touche LLP as our Independent Auditor for Fiscal Year 2024. The Board recommends you vote AGAINST the following proposal ( s ) : 5 through 13 5. Report on Gender- Based Compensation and Benefit Gaps 6. Report on Risk from Omitting Ideology in EEO Policy 7. Report on Government Takedown Requests 8. Report on Risks of Weapons Development 9. Report on Climate Risks to Retirement Plan Beneficiaries 10. Report on Tax Transparency HOUSEHOLDING ELECTION - Please indicate if you consent to receive certain future investor communications in a single package per household. Yes No 0001614289_1 R1.0.0.6 U52025 12 Signature [PLEASE SIGN WITHIN BOX] Date CONTINUED ON THE REVERSE SIDE 0123 4567 8192 1239 12/07/23 123,456,789,012.00000 594918104 *****ACCOUNT P97209-01S GS2

PLEASE ENSURE YOU FOLD, THEN DETACH AND RETAIN THIS PORTION OF THE VOTING INSTRUCTION FORM. 11. Report on Data Operations in Human Rights Hotspots 12. Mandate for Third-Party Political Reporting 13. Report on AI Misinformation and Disinformation *NOTE* Such other business as may properly come before the meeting or any adjournment thereof. For Against Abstain 0001614289_2 R1.0.0.6

IMPORTANT NOTICE REGARDING DELIVERY OF SECURITY HOLDER DOCUMENTS (HH) BROADRIDGE FINANCIAL SOLUTIONS, INC. 3 2 2 OF 2 ATTENTION: TEST PRINT 51 MERCEDES WAY EDGEWOOD, NY 11717 PAGE 2 OF 2 PLEASE RETAIN FOR YOUR RECORDS HHSTD5 HHSTD4 P97209-01S V.2.0 IMPORTANT NOTICE REGARDING HOUSEHOLDING ELECTION OF SHAREHOLDER COMMUNICATIONS In December 2000, the Securities Exchange Commission enacted a rule that allows multiple shareholders residing at the same address the convenience of receiving a single copy of all shareholder communications if they consent to do so. This is known as “Householding”. Please note that if you do not respond to this notice, Householding will start 60 days after the mailing of this notification. We will allow Householding only upon these certain conditions: The issuer agrees to have its documents Househeld. You agree to or do not object to the Householding of your materials. You have the same last name and exact address as another shareholder(s). The HOUSEHOLDING ELECTION, which appears on the enclosed proxy card, provides a means for you to notify us whether or not you consent to participate in Householding. By marking “Yes” in the block provided, you will consent to participate in Householding. By marking “No”, you will withhold your consent to participate. If you do nothing, you will be deemed to have given your consent to participate. Your affirmative or implied consent to Household will remain in effect until you revoke it. If you wish to revoke your consent, please call 1-866-540-7095 and follow the instructions or you may send a written request with your name, the name of your financial institution and your account number at the firm to: Householding Department, 51 Mercedes Way, Edgewood, NY 11717. If you revoke your Householding election, each primary account holder will begin receiving individual copies within 30 days of your revocation.