Document:

<PAGE>   1
                                                                    EXHIBIT 10.1

                                 March 9, 2000

Network Plus, Inc.
Network Plus Corp.
234 Copeland Street
Quincy, MA 02169
Attn: Chief Financial Officer

          Re: October 7, 1998 $60,000,000 Loan and Security Agreement
          -----------------------------------------------------------

Gentlemen:

     Reference is hereby made to that certain Loan and Security Agreement dated
as of October 7, 1998 (as amended, the "Loan Agreement") by and between Network
Plus Corp., a Delaware corporation ("Holdings") and Network Plus, Inc., a
Massachusetts corporation ("NPI"), as borrowers (individually and collectively,
jointly and severally, the "Borrower"), Fleet National Bank, a national banking
association, as Agent ("Agent"), and Goldman Sachs Credit Partners L.P., a
Bermuda limited partnership, as syndication and arrangement agent for the
Lenders (the "S&A Agent"), Fleet National Bank and the other lenders party
thereto from time to time (collectively, the "Lenders"). Capitalized terms used
herein and not otherwise defined shall have the meaning given to such term in
the Loan Agreement.

     The Borrower has requested that the Agent and the Lenders modify the Loan
Agreement so as to, among other things, extend the Maturity Date until December
31, 2000. The Agent and Lenders are willing to extend such accommodation based
upon and subject to the Borrower acknowledging its agreement to pay an extension
fee (the "Extension Fee") equal to two (2%) percent of the Commitment in the
event that the Loan Agreement is not terminated and remains available to the
Borrower beyond June 30, 2000. Such Extension Fee shall be due and payable to
the Lenders based upon each Lender's Pro Rata Share of the Commitment. The terms
and conditions of this letter shall override and govern and control any and all
agreements, written or oral, between the Borrower and any of the Lenders, and
such extension fee shall be in lieu of and not in addition to any extension fee
agreed to by the Borrower with any Lender on or before the date hereof. Your
acceptance of this extension fee arrangement set forth herein is a precondition
to the effectiveness and validity of that certain Amendment Letter dated of even
date.

     Kindly indicate your assent to the foregoing arrangement by signing this
letter on the space provided below.

<PAGE>   2
     This Letter Agreement may be executed in multiple counterparts, each of
which shall constitute an original, but all of which, when taken together, shall
constitute one and the same instrument.

     The parties hereto have caused this Letter Agreement to be duly executed as
a sealed instrument as of the day and year first above written.

                                      Very truly yours,

                                      Fleet National Bank, as Agent and a Lender

                                      By: /s/ David Belanger
                                         ---------------------------------------
                                      Name:   David Belanger
                                           -------------------------------------
                                      Title:  Assistant Vice President
                                             -----------------------------------

<PAGE>   3
                                      Goldman Sachs Credit Partners, L.P., as
                                      S&A Agent and a Lender

                                      By: /s/ Bruce H Mendelsohn
                                         ---------------------------------------
                                      Name:   Bruce H Mendelsohn
                                           -------------------------------------
                                      Title:  Authorized Signatory
                                             -----------------------------------
<PAGE>   4
                                      Transamerica Business Credit Corporation,
                                      as a Lender

                                      By: /s/ Gary P. Moro
                                         ---------------------------------------
                                      Name:   Gary P. Moro
                                           -------------------------------------
                                      Title:  Senior Vice President
                                             -----------------------------------
<PAGE>   5
                                      FINOVA Capital Corporation (successor
                                      in interest to Fremont Financial
                                      Corporation), as a Lender

                                      By: /s/ Gerald C. Wordell
                                         ---------------------------------------
                                      Name: /s/ Gerald C. Wordell
                                           -------------------------------------
                                      Title: Authorized Signer
                                             -----------------------------------
<PAGE>   6
Accepted and Agreed as of the 15th day of March, 2000

Network Plus, Inc., as Borrower

By: /s/ George C. Alex
   -----------------------------
Name: George C. Alex
     ---------------------------
Title: Chief Financial Officer
      --------------------------

Network Plus Corp., as Borrower

By: /s/ George C. Alex
   -----------------------------
Name: George C. Alex
     ---------------------------
Title: Chief Financial Officer
      --------------------------

<PAGE>   7
                                   EXHIBIT A

                                  Schedule C-1

                                  COMMITMENTS

<TABLE>
<CAPTION>
                                      PRO RATA SHARE                  PRO RATA SHARE    TOTAL          PRO RATA
                         TRANCHE A    OF TRANCHE A     TRANCHE B      OF TRANCHE B      COMMITMENTS    SHARE OF TOTAL
LENDER                  COMMITMENT    COMMITMENT       COMMITMENTS    COMMITMENTS       OF LENDER      COMMITMENTS
------                  ----------    --------------   -----------    --------------    -----------    --------------
<S>                  <C>           <C>             <C>            <C>                <C>            <C>

GSCP                        0               0%        $30,000,000         100%          $30,000,000        66-2/3%

FNB                   $15,000,000         100%        $         0           0%          $15,000,000        33-1/3%

All Lenders           $15,000,000         100%        $30,000,000         100%          $45,000,000          100%
</TABLE><PAGE>   1
                                                                    EXHIBIT 10.2

                                        March 15, 2000

Network Plus, Inc.
Network Plus Corp.
234 Copeland Street
Quincy, MA 02169
Attn: Chief Financial Officer

     Re:  October 7, 1998 $60,000,000 Loan and Security Agreement
          -------------------------------------------------------

Gentlemen:

     Reference is hereby made to that certain Loan and Security Agreement dated
as of October 7, 1998 (as amended, the "Loan Agreement") by and between Network
Plus Corp., a Delaware corporation ("Holdings") and Network Plus, Inc., a
Massachusetts corporation ("NPI"), as borrowers (individually and collectively,
jointly and severally, the "Borrower"), Fleet National Bank, a national banking
association, as Agent ("Agent"), and Goldman Sachs Credit Partners L.P., a
Bermuda limited partnership, as syndication and arrangement agent for the
Lenders (the "S&A Agent"), Fleet National Bank and the other lenders party
thereto from time to time (collectively, the "Lenders"). Capitalized terms used
herein and not otherwise defined shall have the meaning given to such term in
the Loan Agreement.

     The Borrower has requested that the Agent and the Lenders amend certain
provisions of the Loan Agreement, as follows:

     1.   The Maturity Date of the Loan Agreement is hereby extended to December
31, 2000, and all references to the "Maturity Date" in the Loan Documents shall
be deemed to mean and refer to December 31, 2000.

     2.   The Borrower, the Agent and the Lenders agree to amend Section 7.20(a)
of the Loan Agreement by deleting Section 7.20(a) of the Loan Agreement in its
entirety and by inserting the following in its place and stead:

          (a) Profitability. Achieve operating EBITDA of not less than the
          amount shown below for the one month period corresponding thereto
          (except for March 31, 1999 which shall be for the six month period and
          for March 31, 2000, June 30, 2000, September 30, 2000 and December 31,
          2000, which shall each be for the three month period then ending):

<PAGE>   2

<TABLE>
         Period ending                            Minimum operating EBITDA
         -------------                            ------------------------
<S>                                              <C>

For the six month period ending                         ($7,000,000)
March 31, 1999

For the one month period ending                         ($1,800,000)
April 30, 1999

For the one month period ending                         ($2,800,000)
May 31, 1999

For the one month period ending                         ($2,700,000)
June 30, 1999

For the one month period ending                         ($2,500,000)
July 31, 1999

For the one month period ending                         ($2,200,000)
August 31, 1999

For the one month period ending                         ($1,800,000)
September 30, 1999

For the one month period ending                         ($1,600,000)
October 31, 1999

For the one month period ending                         ($1,800,000)
November 30, 1999

For the one month period ending                         ($4,000,000)
December 31, 1999

For the three month period ending                       ($11,500,000)
March 31, 2000

For the three month period ending                       ($9,750,000)
June 30, 2000

For the three month period ending                       ($6,950,000)
September 30, 2000

For the three month period ending                       ($3,450,000)
December 31, 2000
</TABLE>

3.        The Borrower, the Agent and the Lenders agree to amend Section
7.20(b) of the Loan Agreement by deleting Section 7.20(b) of the Loan Agreement
in its entirety and by inserting the following in its place and stead;

<PAGE>   3
(b)  Total Revenues. Achieve total revenues, determined in accordance with GAAP,
of not less than the amount shown below for the period corresponding thereto:

<TABLE>
Period                                  Minimum Total Revenue
-------------------------------         ---------------------
<S>                                     <C>
For the six month period ending         $56,100,000
March 31, 1999

For the six month period ending         $61,500,000
June 30, 1999

For the six month period ending         $70,000,000
September 30, 1999

For the six month period ending         $79,500,000
December 31, 1999

For the three month period ending       $42,000,000
March 31, 2000

For the three month period ending       $50,000,000
June 30, 2000

For the three month period ending       $58,200,000
September 30, 2000

For the three month period ending       $67,825,000
December 31, 2000
</TABLE>

     4.   The amendments set forth herein shall be effective as of December 31,
1999.

     5.   Notwithstanding the foregoing amendments, each and every term,
condition and other provision on the Loan Agreement (as previously amended and
as amended hereby) shall continue in full force and effect. The Borrower
ratifies and confirms all of the representations, warranties and covenants
contained in the Loan Agreement as modified hereby and agrees that the Agent and
the Lenders may continue to rely upon all of the representations, warranties and
covenants contained therein.

     6.   This Letter Agreement incorporates all discussions and negotiations
between the Agent, the Lenders and the Borrower, either express or implied,
concerning the matters included herein, any custom, usage, or course of dealing
to the contrary notwithstanding. No such discussions, negotiations, custom,
usage, or course of dealing shall limit, modify or otherwise affect the
provisions hereof. No modifications, amendment or waiver of any provision of
this Letter Agreement is effective unless executed in writing by the party to be
charged with such modification, amendment or waiver, and if such party be the
Agent, then by a duly authorized
<PAGE>   4
officer thereof.

     7.   This Letter Agreement may be executed in multiple counterparts, each
of which shall constitute an original, but all of which, when taken together,
shall constitute one and the same instrument.

     8.   The parties hereto have caused this Letter Agreement to be duly
executed as a sealed instrument as of the day and year first above written.

                                   Very Truly yours,

                                   Fleet National Bank, as Agent and a Lender

                                   By: /s/ David Belanger
                                     -------------------
                                   Name:  DAVID BELANGER
                                   Title: Assistant V.P.
<PAGE>   5

                              Goldman Sachs Credit Partners, L.P., as
                              S&A Agent and a Lender

                              By: /s/ JOHN URBAN
                                  -------------------
                                  Name:   JOHN URBAN
                                  Titel:  Authorized Signatory
<PAGE>   6
                            FINOVA Capital Corporation (successor in interest
                            to Fremont Financial Corporation),
                            as a Lender

                            By: /s/ Richard A. Sutton
                               -------------------------
                            Name:  Richard A. Sutton
                            Title: Vice President and CA
<PAGE>   7

                              Transamerica Business Credit Corporation,
                              as a Lender

                              By:  /s/ Gary P. Moro
                                  -----------------------
                                  Name: Gary P. Moro
                                  Title: Senior Vice President

<PAGE>   8
Accepted and Agreed as of the 15th day of March, 2000

Network Plus Inc., as Borrower

By: /s/ George C. Alex
    -------------------------------
    Name:  George C. Alex
    Title: Chief Financial Officer

Network Plus Corp., as Borrower

By: /s/ George C. Alex
    -------------------------------
    Name:  George C. Alex
    Title: Chief Financial Officer

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