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<DESCRIPTION>EXHIBIT 2.1(C) - PURCHASE AGREEMENT AND NOTE

<TEXT>







                       INTERFACE SYSTEMS, INC.



                    CONVERTIBLE SUBORDINATED NOTE

                         PURCHASE AGREEMENT



      THIS CONVERTIBLE SUBORDINATED NOTE PURCHASE AGREEMENT (this

"Agreement") is made as of the 28th day of June, 2000, by and between

Interface Systems, Inc., a Michigan corporation ("Interface" or the

"Company"), and Tumbleweed Communications Corp., a Delaware corporation

("Purchaser" or the "Parent").



                              RECITALS



      WHEREAS, the Board of Directors of the Company has approved the

issuance of Common Stock, no par value (the "Common Stock") in accordance

with the Notes, as defined below;



      WHEREAS, the Board of Directors of the Company has approved the sale

and issuance of an aggregate of up to $3,000,000 of Convertible

Subordinated Notes (individually, a "Note" and collectively, the "Notes")

which can be converted into Common Stock;



      WHEREAS, the Purchaser desires to purchase Notes on the terms and

conditions set forth herein; and



      WHEREAS, the Company desires to issue and sell Notes to the Purchaser on

the terms and conditions set forth herein;



      NOW, THEREFORE, in consideration of the foregoing recitals and the

mutual promises hereinafter set forth, the parties hereto agree as follows:



1.    PURCHASE AND SALE OF STOCK.



      1.1   SALE AND ISSUANCE OF NOTES.



      (a) Subject to the terms and conditions of this Agreement, the

Purchaser agrees, to purchase at the Closings and the Company agrees to

sell and issue to the Purchaser, a Note for $2,000,000 (the "$2,000,000

Note") and a Note for $1,000,000 (the "$1,000,000 Note").



      1.2   THE CLOSINGS.



      (a) The purchase and sale of the $2,000,000 Note shall take place at

the offices of Skadden, Arps, Slate, Meagher & Flom LLP, Palo Alto,

California, at 5:00 p.m., on July 3, 2000, or at such other time and place

as the Company and the Purchaser shall mutually agree, either orally or in

writing (which time and place are designated as the "$2,000,000 Closing").



      (b) The purchase and sale of the $1,000,000 Note shall take place at

the offices of Skadden, Arps, Slate, Meagher & Flom LLP, Palo Alto,

California, at 5:00 p.m., on September 5, 2000, or at such other time and

place as the Company and the Purchaser shall mutually agree, either orally

or in writing (which time and place are designated as the "$1,000,000

Closing" and together with the $2,000,000 Closing, the "Closings").



      (c) At each of the Closings, the Company shall deliver to the

Purchaser a Note in exchange for payment of the purchase price therefor by

check, wire transfer, or such other form of payment as shall be mutually

agreed upon by the Purchaser and the Company.



2.    REPRESENTATIONS AND WARRANTIES OF THE COMPANY.



      Reference is made to that certain Agreement and Plan of Merger by and

among Parent, Maize Acquisition Sub, Inc., a Delaware corporation, and the

Company dated June 28, 2000 (the "Merger Agreement"). The Company hereby

represents, warrants and covenants to the Purchaser each of the

representations, warranties and covenants set forth in Article III of the

Merger Agreement subject to the exceptions set forth in the Disclosure

Schedule thereto, which is incorporated by reference herein, and further

represents, warrants, and covenants, specifically identifying the relevant

subparagraph(s) hereof and attached hereto, as follows:





      2.1   REGISTRATION RIGHTS.



      Except as provided in the Merger Agreement, the Company is presently

not under any obligation and has not granted any rights to register under

the Securities Act any of its presently outstanding securities or any of

its securities that may subsequently be issued.



      2.2   AUTHORIZATION.



      All corporate action on the part of the Company, its officers,

directors and shareholders necessary for the authorization, execution and

delivery of this Agreement, that certain Registration Rights Agreement by

and between the Company and Parent (the "Registration Rights Agreement")

and the Notes, the performance of all obligations of the Company hereunder

and thereunder at the Closings and the authorization, issuance (or

reservation for issuance), sale, and delivery of the Notes being sold

hereunder and the Common Stock issuable upon conversion thereof has been

taken or will be taken prior to the Closings, and this Agreement, the

Registration Rights Agreement, and the Notes, when executed and delivered,

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