<SEQUENCE>2

<FILENAME>0002.txt

<DESCRIPTION>EXHIBIT 2.1 - MERGER AGREEMENT

<TEXT>







                                 AGREEMENT





                                    and





                               PLAN OF MERGER







                                by and among







                      TUMBLEWEED COMMUNICATIONS CORP.,







                        MAIZE ACQUISITION SUB, INC.





                                    and







                          INTERFACE SYSTEMS, INC.













                        AGREEMENT AND PLAN OF MERGER





            AGREEMENT AND PLAN OF MERGER (this "Agreement"), dated as of

June 28, 2000, by and among Tumbleweed Communications Corp., a Delaware

corporation ("Parent"), Maize Acquisition Sub, Inc., a Delaware corporation

and a direct wholly-owned subsidiary of Parent ("Sub"), and Interface

Systems, Inc., a Michigan corporation (the "Company").



                                WITNESSETH:

                                ----------



            WHEREAS, the Boards of Directors of Parent and Sub have

approved, and deem it advisable and in the best interests of their

respective stockholders to consummate, a strategic business combination

between the Company and Parent upon the terms and subject to the conditions

set forth herein;



            WHEREAS, the Board of Directors of the Company, having

determined that such combination is desirable, has approved the

transactions contemplated by this Agreement and the Ancillary Agreements

(as defined below);



            WHEREAS, as a condition and inducement to Parent's and Sub's

willingness to enter into this Agreement and incur the obligations set

forth herein, concurrently with the execution and delivery of this

Agreement, (i) Parent and each of the directors, executive officers and

other designated employees of the Company have entered into a Voting

Agreement in the form of Exhibit A hereto (the "Voting Agreements"),

pursuant to which, among other things, such persons agree to vote in favor

of approval and adoption of this Agreement; (ii) the Company and certain

key employees of the Company identified in Schedule B hereto have entered

into non- competition agreements (the "Non-Competition Agreements") in the

form of Exhibit B-1 hereto, and employment agreements (the "Employment

Agreements") in the form of Exhibit B-2 hereto, the effectiveness of which

are conditioned upon the consummation of the transactions contemplated

hereby; and (iii) Parent and the Company have entered into an Option

Agreement in the form of Exhibit C hereto (the "Option Agreement"),

pursuant to which, among other things, the Company grants to Parent an

option to purchase newly issued shares of Company Common Stock representing

nineteen and nine-tenths percent (19.9%) of the total outstanding shares of

Company Common Stock (the Voting Agreements, the Non-Competition

Agreements, the Employment Agreements and the Option Agreement are

collectively referred to herein as the "Ancillary Agreements"); and



            WHEREAS, for United States federal income tax purposes, it is

intended that the Merger (as defined in Section 1.1 hereof) shall qualify

as a reorganization within the meaning of Section 368(a) of the Internal

Revenue Code of 1986, as amended, and the rules and regulations promulgated

thereunder (the "Code"), and this Agreement is intended to be and is

adopted as a plan of reorganization within the meaning of Section 368 of

the Code.



            NOW, THEREFORE, in consideration of the foregoing and the

respective representations, warranties, covenants and agreements, and other

good and valuable consideration, set forth herein and in the Ancillary

Agreements, the receipt and sufficiency of which are hereby acknowledged,

the parties hereto agree as follows:



                                 ARTICLE I



                                   MERGER



            Section 1.1 The Merger. Subject to the terms and conditions of

this Agreement, at the Effective Time (as defined in Section 1.2 hereof),

the Company and Sub shall consummate a merger (the "Merger") pursuant to

which (a) Sub shall be merged with and into the Company and the separate

corporate existence of Sub shall thereupon cease, (b) the Company shall be

the successor or surviving corporation (the "Surviving Corporation") in the

Merger and shall continue to be governed by the laws of the State of

Michigan and (c) the separate corporate existence of the Company, with all

its rights, privileges, immunities, powers and franchises, shall continue

unaffected by the Merger.



            Pursuant to the Merger, (a) the Articles of Incorporation set

forth in the Certificate of Merger (as defined in Section 1.2 hereof),

shall be the Articles of Incorporation of the Surviving Corporation until

thereafter amended as provided by law and such Articles of Incorporation,

and (b) the By-laws, in the form of Annex A hereto, shall be the By-laws of

the Surviving Corporation until thereafter amended as provided by law, such

Articles of Incorporation and such By-laws. The Merger shall have the

effects set forth in the Michigan Business Corporation Act (the "MBCA") and

the Delaware General Corporation Law (the "DGCL").



            Section 1.2 Effective Time. Parent, Sub and the Company will

cause (i) a certificate of merger (the "Certificate of Merger") in the form

of Exhibit D-1 hereto, to be filed on the Closing Date (as defined in

Section 1.3 hereof) (or on such other date as Parent and the Company may

agree) with the Department of Consumer and Industry Services, Corporations

Bureau, of the State of Michigan (the "Michigan Department") as provided in

the MBCA, and (ii) a certificate of merger (the "Delaware Certificate of

Merger") in the form of Exhibit D-2 hereto, to be filed on the Closing Date

with the Secretary of State of the State of Delaware as provided in the

DGCL. The Merger shall become effective on the date on which the

Certificate of Merger and any other documents necessary to effect the

Merger in accordance with the MBCA are duly filed with the Michigan

Department (the "Merger Filing") or such time as is agreed upon by the

parties and specified in the Certificate of Merger, and such time is

hereinafter referred to as the "Effective Time."



            Section 1.3 Closing. The closing of the Merger (the "Closing")

will take place at 8:00 a.m., local time, on a date to be specified by the

parties, which shall be no later than the second business day after

satisfaction or waiver of all of the conditions set forth in Article VI

hereof (the "Closing Date"), at the offices of Skadden, Arps, Slate,

Meagher & Flom LLP, 525 University Avenue, Palo Alto, California 94301, or

such other date or place as agreed to in writing by the parties hereto.



            Section 1.4 Directors and Officers of the Surviving

Corporation. The directors and officers of the Sub at the Effective Time

shall, from and after the Effective Time, be the directors and officers,

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