EXHIBIT 10.42

                         CHOICE ONE COMMUNICATIONS INC.




                      WARRANT FOR THE PURCHASE OF SHARES OF
                 COMMON STOCK OF CHOICE ONE COMMUNICATIONS INC.



NO. 1                                                       WARRANT TO PURCHASE
                                                                 945,147 SHARES



         THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
         AS AMENDED, OR ANY STATE SECURITIES LAWS AND MAY NOT BE OFFERED OR SOLD
         EXCEPT IN COMPLIANCE THEREWITH. THIS WARRANT AND THE SHARES OF COMMON
         STOCK ISSUED HEREUNDER ARE SUBJECT TO AND HAVE THE BENEFIT OF AN EQUITY
         REGISTRATION RIGHTS AGREEMENT DATED AS OF NOVEMBER 9, 2001 AMONG CHOICE
         ONE COMMUNICATIONS INC. AND THE WARRANTHOLDERS PARTY THERETO AND
         SECTIONS 6.01, 6.05 AND 6.06 OF A TRANSACTION AGREEMENT, DATED AS OF
         JULY 8, 1998, AS AMENDED INCLUDING PURSUANT TO AMENDMENT NO. 10
         THERETO, AMONG CHOICE ONE COMMUNICATIONS INC., THE WARRANTHOLDERS PARTY
         THERETO AND CERTAIN OTHER STOCKHOLDERS OF CHOICE ONE COMMUNICATIONS
         INC., A COPY OF EACH OF WHICH MAY BE OBTAINED UPON REQUEST FROM CHOICE
         ONE COMMUNICATIONS INC.


         FOR VALUE RECEIVED, CHOICE ONE COMMUNICATIONS INC., a Delaware
corporation (the "CORPORATION"), hereby certifies that MORGAN STANLEY & CO.
INCORPORATED (together with its successor or permitted assigns, the "Holder"),
is entitled, subject to the provisions of this Warrant (this "WARRANT"), to
purchase from the Corporation, at the times specified herein, 945,147 fully paid
and non-assessable shares of common stock of the Corporation, par value $0.01
per share (the "COMMON STOCK"), at a purchase price per share equal to the
Exercise Price (as hereinafter defined). The number of shares of Common Stock to
be received upon the exercise of this Warrant and the Exercise Price (as
hereinafter defined) to be paid for a share of Common Stock are subject to
adjustment from time to time as hereinafter set forth.

1.       Definitions.  (a)  The following terms, as used herein, have the
following meanings:

         "BUSINESS DAY" means any day except a Saturday, Sunday or other day on
which commercial banks in New York, New York are authorized by law to close.

         "COMMON SHARE EQUIVALENT" means, with respect to any security of the
Corporation (other than the Warrants) and as of a given date, a number which is,
(i) in the case of a share of Common Stock, one, (ii) in the case of all or a
portion of any right, warrant or other security which may be exercised for a
share or shares of Common Stock, the number of shares of Common Stock receivable
upon exercise of such security (or such portion of such security) and (iii) in
the case of any security convertible into or exchangeable for a share or shares
of Common Stock, the number of shares of Common Stock that would be received if
such security were converted or exchanged on such date.

         "EQUITY REGISTRATION RIGHTS AGREEMENT" means the Equity Registration
Rights Agreement dated as of November 9, 2001 among the Corporation and the
holders of Warrants party thereto, as amended from time to time in accordance
with its terms.

         "EXERCISE PRICE" means the price per Warrant Share at which the Warrant
Shares are exercisable hereunder, as such price may be adjusted from time to
time as provided herein. The Exercise Price is initially $2.25225.

         "EXPIRATION DATE" means November 9, 2006 at 5:00 p.m. New York City
time.

         "FAIR MARKET VALUE" means, with respect to a share of Common Stock or
preferred stock of the Corporation ("PREFERRED STOCK") or other securities of
the Corporation (other than options, rights, warrants or other securities
convertible into or exchangeable or exercisable for shares of Common Stock) on
any date, the average closing sales price per share (or other similar unit) of
such security on the principal market on which such security is traded for the
20 trading days immediately preceding (but not including) such date, or, if such
security is not publicly traded, the Fair Market Value of such share (or other
similar unit) shall be determined as of such date by the Board of Directors of
the Corporation; provided that if the Majority Warrant Holders in their
discretion do not agree with the determination of the Board of Directors, the
Fair Market Value of such share (or other similar unit) that is not publicly
traded shall be determined by a nationally recognized firm of investment bankers
reasonably acceptable to the Corporation and the Majority Warrant Holders. The
fees of any such firm in connection with any determination of Fair Market Value
of any share (or other similar unit) shall be paid as follows: (i) if such Fair
Market Value as determined by the Board of Directors of the Corporation (the
"CORPORATION VALUE") and such Fair Market Value as determined by such firm (the
"FIRM VALUE") differ by an amount of 15% or less of the Corporation Value, then
such fees shall be borne equally by the Corporation and the Holders (each of
whom shall be severally liable for its pro rata share of the portion of such
fees allocable to the Holders), (ii) if such Firm Value is greater than such
Corporation Value by more than 15% of such Corporation Value, then such fees
shall be borne entirely by the Corporation and (iii) if such Corporation Value
is greater than such Firm Value by more than 15% of such Corporation Value, then
such fees shall be borne entirely by the Holders (each of whom shall be
severally liable for its pro rata share of such fees).

         "HOLDERS" all of the Persons who are holders of the Warrants.

         "MAJORITY WARRANT HOLDERS" means, at any time, holders of Warrants
exercisable for a majority of the aggregate number of shares of Common Stock
with respect to which the Warrants are exercisable at such time.

         "PERSON" means an individual, a partnership, a corporation, a limited
liability company, an association, a joint stock company, a trust, a joint
venture, an unincorporated organization and a governmental entity or any
department, agency or political subdivision thereof.

         "TRANSACTION AGREEMENt" means the Transaction Agreement, dated as of
July 8, 1998, as amended including pursuant to amendment no. 10 thereto, among
the Corporation, the warrantholders party thereto and certain other stockholders
of the Corporation

         "WARRANT SHARE AMOUNT" means, at any time, the number of Warrant Shares
into which this Warrant is exercisable at such time.

         "WARRANT SHARES" means the shares of Common Stock deliverable upon
exercise of this Warrant, as adjusted from time to time as hereinafter set
forth.

         "WARRANTS" means this Warrant and any other warrants subject to or
entitled to benefits under the Equity Registration Rights Agreement and Sections
6.01, 6.05 and 6.06 of the Transaction Agreement.

(b)  Capitalized terms used but not defined herein shall have the meanings
assigned to such terms in the Equity Registration Rights Agreement.

2.       Exercise of Warrant.

(a)  The Holder is entitled to exercise this Warrant in whole or in part
at any time, or from time to time, until the Expiration Date or, if such day is
not a Business Day, then on the next succeeding day that shall be a Business
Day. To exercise this Warrant, the Holder shall execute and deliver to the
Corporation a Warrant Exercise Notice substantially in the form annexed hereto
(each a "WARRANT EXERCISE NOTICE"), along with this Warrant, together with (i)
payment of the applicable Exercise Price or (ii) a written notice to the
Corporation that the Holder is exercising the Warrant (or a portion thereof) by
authorizing the Corporation to withhold from issuance a number of shares of
Common Stock issuable upon such exercise of this Warrant which when multiplied
by the Fair Market Value of one share of Common Stock is equal to the aggregate
Exercise Price for the number of shares of Common Stock being purchased
(including the shares being withheld to satisfy the Exercise Price) upon such
exercise (and such withheld shares shall no longer be issuable under this
Warrant). Upon such delivery and payment, the Holder shall be deemed to be the
holder of record of the Warrant Shares subject to such exercise, notwithstanding
that the stock transfer books of the Corporation shall then be closed or that
certificates representing such Warrant Shares shall not then be actually
delivered to the Holder.

(b)  If the Holder shall choose to pay the Exercise Price in connection
with any exercise of this Warrant (as permitted by clause (i) of Section 2(a)),
the Exercise Price may be paid in immediately available funds in cash or by
certified or official bank check or bank cashier's check payable to the order of
the Corporation or by any combination of such cash or check. The Corporation
shall pay any and all documentary, stamp or similar issue or transfer taxes
payable in respect of the issue or delivery of the Warrant Shares except for any
documentary, stamp or similar issue or transfer taxes due as a result of the
issuance or delivery of Warrant Shares to a Person other than the registered
Holder of this Warrant.

(c)  If the Holder exercises this Warrant in part, this Warrant shall be
surrendered by the Holder to the Corporation and a new Warrant Certificate of
the same tenor and for the unexercised number of Warrant Shares shall be
executed by the Corporation. The Corporation shall promptly register the new
Warrant Certificate in the name of the Holder or in such name or names of its
transferee pursuant to paragraph 6 hereof as may be directed in writing by the
Holder and deliver the new Warrant Certificate to the Person or Persons entitled
to receive the same.

(d)  Upon surrender of this Warrant in conformity with the foregoing
provisions, the Corporation shall promptly transfer to the Holder of this
Warrant appropriate evidence of ownership of the shares of Common Stock or other
securities or property (including any money) to which the Holder is entitled,
registered or otherwise placed in, or payable to the order of, the name or names
of the Holder or as may be directed in writing by the Holder (including the name
or names of any transferee of the Holder to whom this Warrant has been
transferred in whole or in part in accordance with Section 6), and shall deliver
such evidence of ownership and any other securities or property (including any
money) to the Person or Persons entitled to receive the same, together with an
amount in cash in lieu of any fraction of a share as provided in paragraph 5
below.

(e)  Notwithstanding any other provision hereof, if an exercise of all or
any portion of this Warrant is to be made in connection with a registered public
offering of any capital stock of the Corporation or any sale of the Corporation,
the exercise of all or any portion of this Warrant may, at the election of the
Holder, be conditioned upon the consummation of such public offering or sale of
the Corporation, and such exercise shall not be deemed to be effective until the
consummation of such public offering or sale.

3.  Restrictive Legend.  Certificates representing shares of Common Stock
issued pursuant to this Warrant shall bear a legend substantially in the form
of the legend set forth on the first page of this Warrant.

4.  Reservation of Shares. The Corporation hereby agrees that at all
times there shall be reserved for issuance and delivery upon exercise of this
Warrant such number of its authorized but unissued shares of Common Stock or
other securities of the Corporation from time to time issuable upon exercise of
this Warrant as will be sufficient to permit the exercise in full of this
Warrant. All such shares shall be duly authorized and, when issued upon such
exercise, shall be validly issued, fully paid and non-assessable, free and clear
of all liens, security interests, charges and other encumbrances or restrictions
on sale and free and clear of all preemptive rights, in each case except to the
extent set forth in the Equity Registration Rights Agreement and Sections 6.01,
6.05 and 6.06 of the Transaction Agreement, or created or imposed by the Holder.

5.  Fractional Shares. No fractional shares or scrip representing
fractional shares shall be issued upon the exercise of this Warrant, and in lieu
of delivery of any such fractional share upon any exercise hereof, the
Corporation shall pay to the Holder an amount in cash equal to such fraction
multiplied by the Fair Market Value per share of Common Stock as of the date of
such exercise.

6.   Exchange, Transfer or Assignment of Warrant.

(a)  This Warrant and all rights hereunder are not transferable by the
Holder hereof except to any Person who, prior to such transfer, agrees in
writing to the terms and conditions hereof, including that this Warrant and the
shares issued on exercise hereof shall be subject to the provisions of the
Equity Registration Rights Agreement and Sections 6.01, 6.05 and 6.06 of the
Transaction Agreement. Each taker and holder of this Warrant by taking or
holding the same, consents and agrees that the registered holder hereof may be
treated by the Corporation and all other Persons dealing with this Warrant as
the absolute owner hereof for any purpose and as the Person entitled to exercise
the rights represented hereby.

(b)  Subject to Section 6(a) hereof and to the requirements of state and
federal securities laws, the Holder of this Warrant shall be entitled to assign
and transfer this Warrant, at any time in whole or from time to time in part, to
any Person or Persons. Subject to the preceding sentence, upon surrender of this
Warrant to the Corporation, together with the attached Warrant Assignment Form
duly executed, the Corporation shall, without charge, execute and deliver a new
Warrant in the name of the assignee or assignees named in such instrument of
assignment and, if the Holder's entire interest is not being assigned, in the
name of the Holder, and this Warrant shall promptly be canceled.

7.  Loss or Destruction of Warrant. Upon receipt by the Corporation of
evidence reasonably satisfactory to it of the loss, theft, destruction or
mutilation of this Warrant, and (in the case of loss, theft or destruction) of
any indemnification agreement reasonably satisfactory to the Corporation and (in
the case of mutilation) upon surrender and cancellation of this Warrant, the
Corporation shall execute and deliver a new Warrant Certificate of like tenor
and date. The Corporation agrees that in the case of the original Holder of this
Warrant, a written agreement of indemnity given by such original Holder alone
shall be satisfactory to the Corporation and no further bond, backstop or
security shall be required.

8.       Anti-dilution Provisions.

(a)  Common Stock Dividends, Subdivisions, Combinations. In case the
Corporation shall (i) pay or make a dividend or other distribution to all
holders of its Common Stock in shares of Common Stock, (ii) subdivide, split or
reclassify the outstanding shares of its Common Stock into a larger number of
shares, or (iii) combine or reclassify the outstanding shares of its Common
Stock into a smaller number of shares, then in each such case the Warrant Share
Amount shall be adjusted to equal the number of such shares to which the holder
of this Warrant would have been entitled upon the occurrence of such event had
this Warrant been exercised immediately prior to the happening of such event or,
in the case of a stock dividend or other distribution, immediately prior to the
record date for determination of stockholders entitled thereto. An adjustment
made pursuant to this Section 8(a) shall become effective immediately after such
record date in the case of a dividend or distribution and immediately after the
effective date in the case of a subdivision, split, combination or
reclassification.

(b)  Reorganization or Reclassification. In case of any capital reorganization
or any reclassification of the capital stock of the Corporation
(whether pursuant to a merger or consolidation or otherwise (but excluding any
event described in Section 8(a) above)), this Warrant shall thereafter be
exercisable for the number of shares of stock or other securities or property
receivable upon such capital reorganization or reclassification of capital
stock, as the case may be, by a holder of the number of shares of Common Stock
into which this Warrant was exercisable immediately prior to such capital
reorganization or reclassification of capital stock; and, in any case,
appropriate adjustment shall be made in the application of the provisions herein
set forth with respect to the rights and interests thereafter of the Holder of
this Warrant to the end that the provisions set forth herein shall thereafter be
applicable, as nearly as reasonably may be, in relation to any shares of stock
or other securities or property thereafter deliverable upon the exercise of this
Warrant.

(c)  Distributions of Assets or Securities Other Than Common Stock. In
case the Corporation shall, by dividend or otherwise, distribute to all holders
of its Common Stock shares of any of its capital stock (other than Common
Stock), rights or warrants to purchase any of its securities (other than those
referred to in Section 8(d) below), cash, other assets or evidences of its
indebtedness, then in each such case the Warrant Share Amount shall be adjusted
by multiplying the Warrant Share Amount immediately prior to the date of such
dividend or distribution by a fraction, of which the numerator shall be the Fair
Market Value per share of Common Stock at the record date for determining
stockholders entitled to such dividend or distribution, and of which the
denominator shall be such Fair Market Value per share of Common Stock less the
fair market value of such dividend or distribution per share of Common Stock (as
determined in good faith by the Board of Directors of the Corporation).

(d)  Below Market Distributions or Issuances of Common Stock. In case the
Corporation shall issue Common Stock (or options, rights, warrants or other
securities convertible into or exchangeable or exercisable for shares of Common
Stock) at a price per share (or having an effective exercise, exchange or
conversion price per share) less than the Fair Market Value per share of Common
Stock on the date such Common Stock (or options, rights, warrants or other
securities convertible into or exchangeable or exercisable for shares of Common
Stock) is sold or issued (provided that no sale of securities pursuant to an
underwritten public offering shall be deemed to be for less than Fair Market
Value), then in each such case the Warrant Share Amount shall thereafter be
adjusted by multiplying the Warrant Share Amount immediately prior to the date
of issuance of such Common Stock (or options, rights, warrants or other
securities) by a fraction, the numerator of which shall be (x) the sum of (i)
the number of Common Share Equivalents represented by all securities outstanding
immediately prior to such issuance and (ii) the aggregate consideration, if any,
to be received by the Corporation upon the issuance of such additional Common
Share Equivalents represented by all securities so issued multiplied by (y) the
Fair Market Value of a share of Common Stock immediately prior to the date of
such issuance, and the denominator of which shall be (x) the product of (A) the
Fair Market Value of a share of Common Stock immediately prior to the date of
such issuance and (B) the number of Common Share Equivalents represented by all
securities outstanding immediately prior to such issuance plus (y) the aggregate
consideration received by the Corporation for the total number of Securities so
issued plus, (z) in the case of options, rights, warrants or other securities
convertible into or exchangeable or exercisable for shares of Common Stock, the
additional consideration required to be received by the Corporation upon the
exercise, exchange or conversion of such securities. An adjustment made pursuant
to this Section 8(d) shall become effective immediately after the date such
Common Stock or other security is sold or issued. Notwithstanding anything
herein to the contrary, (1) no further adjustment to the Warrant Share Amount
shall be made (x) upon the issuance or sale of Common Stock pursuant to the
exercise of any options, rights or warrants or (y) upon the issuance or sale of
Common Stock pursuant to the conversion or exchange of any convertible
securities, if the adjustment in the Warrant Share Amount was made as required
hereby upon the issuance or sale of such options, rights, warrants or securities
or no adjustment was required hereby at the time such option, right, warrant or
convertible security was issued and (2) no adjustment to the Warrant Share
Amount shall be made upon the issuance or sale of Common Stock upon the exercise
of any of the Corporation's other Warrants. In the event that any options,
rights, warrants or other securities convertible into or exchangeable or
exercisable for shares of Common Stock, the issuance of which resulted in an
adjustment pursuant to this Section 8(d), shall expire without being converted,
exchanged or exercised, the adjustment made pursuant to this Section 8(d) with
respect to such securities which have expired shall be reversed so that, as
readjusted, the Warrant Share Amount is what it would have been had such
securities which expired never been issued. No such readjustment shall apply
with respect to any portion of this Warrant which has been exercised prior to
the expiration of such securities which expired.

(e)  Below Market Distributions or Issuances of Preferred Stock or Other
Securities. In case the Corporation shall issue Preferred Stock (or other
securities of the Corporation other than Common Stock or options, rights,
warrants or other securities convertible into or exchangeable or exercisable for
shares of Common Stock) at a price per share (or other similar unit) less than
the Fair Market Value per share (or other similar unit) of such Preferred Stock
(or other security) on the date such Preferred Stock (or other security) is sold
(provided that no sale of Preferred Stock or other securities pursuant to an
underwritten public offering shall be deemed to be for less than Fair Market
Value), then in each such case the Warrant Share Amount shall thereafter be
adjusted by multiplying the Warrant Share Amount immediately prior to the date
of issuance of such Preferred Stock (or other security) by a fraction, the
numerator of which shall be the product of (i) the number of Common Share
Equivalents represented by all securities outstanding immediately prior to such
issuance and (ii) the Fair Market Value of a share of Common Stock immediately
prior to the date of such issuance, and the denominator of which shall be (x)
the product of (A) the number of Common Share Equivalents represented by all
securities outstanding immediately prior to such issuance and (B) the Fair
Market Value of a share of the Common Stock immediately prior to the date of
such issuance minus (y) the difference between (I) the aggregate Fair Market
Value of such Preferred Stock (or other security) and (II) the aggregate
consideration received by the Corporation for such Preferred Stock (or other
security) plus, in the case of options, rights, warrants or other securities
convertible into or exchangeable or exercisable for shares of Preferred Stock or
other securities other than Common Stock, the additional consideration required
to be received by the Corporation upon the exercise, exchange or conversion of
such securities. An adjustment made pursuant to this Section 8(e) shall become
effective immediately after the date such Preferred Stock (or other security) is
sold. In the event that any options, rights, warrants or other securities
convertible into or exchangeable or exercisable for shares of Preferred Stock or
other securities other than Common Stock, the issuance of which resulted in an
adjustment pursuant to this Section 8(e), shall expire without being converted,
exchanged or exercised, the adjustment made pursuant to this Section 8(e) with
respect to such securities which have expired shall be reversed so that, as
readjusted, the Warrant Share Amount is what it would have been had such
securities which expired never been issued. No such readjustment shall apply
with respect to any portion of this Warrant which has been exercised prior to
the expiration of such securities which expired.

(f)  Above Market Repurchases of Common Stock. If at any time or from time
to time the Corporation or any Subsidiary thereof shall repurchase, by
self-tender offer or otherwise, any shares of Common Stock of the Corporation
(or any security convertible into or exercisable or exchangeable for shares of
Common Stock) at a weighted average purchase price in excess of the Fair Market
Value thereof, on the Business Day immediately prior to the earliest of (i) the
date of such repurchase, (ii) the commencement of an offer to repurchase or
(iii) the public announcement of either (such date being referred to as the
"DETERMINATION DATE"), the Warrant Share Amount shall thereafter be adjusted by
multiplying the Warrant Share Amount immediately prior to such Determination
Date by a fraction, the numerator of which shall be the product of (1) the
number of Common Share Equivalents represented by all securities outstanding
immediately prior to such Determination Date minus the number of Common Share
Equivalents represented by the securities repurchased or to be purchased by the
Corporation or any Subsidiary thereof in such repurchase and (2) the Fair Market
Value of a share of Common Stock immediately prior to such Determination Date,
and the denominator of which shall be (x) the product of (A) the number of
Common Share Equivalents represented by all securities outstanding immediately
prior to the Determination Date and (B) the Fair Market Value of a share of
Common Stock immediately prior to such Determination Date minus (y) the sum of
(I) the aggregate consideration paid by the Corporation in connection with such
repurchase and (II) in the case of options, rights, warrants or other securities
convertible into or exchangeable or exercisable for shares of Common Stock, the
additional consideration required to be received by the Corporation upon the
exercise, exchange or conversion of such securities. An adjustment made pursuant
to this Section 7(f) shall become effective immediately after the effective date
of such repurchase.

(g)  Above Market Repurchases of Preferred Stock or Other Securities. If
at any time or from time to time the Corporation or any Subsidiary thereof shall
repurchase, by self-tender offer or otherwise, any shares of Preferred Stock (or
other securities of the Corporation other than Common Stock or options, rights,
warrants or other securities convertible into or exchangeable or exercisable for
shares of Common Stock) at a weighted average purchase price in excess of the
Fair Market Value thereof, on the Business Day immediately prior to the
Determination Date, the Warrant Share Amount shall thereafter be adjusted by
multiplying the Warrant Share Amount immediately prior to the Determination Date
by a fraction, the numerator of which shall be the product of (i) the number of
Common Share Equivalents represented by all securities outstanding immediately
prior to such Determination Date and (ii) the Fair Market Value of a share of
Common Stock immediately prior to such Determination Date, and the denominator
of which shall be (x) the product of (A) the number of Common Share Equivalents
represented by all securities outstanding immediately prior to such
Determination Date and (B) the Fair Market Value of a share of Common Stock
immediately prior to such Determination Date minus (y) the difference between
(I) the aggregate consideration paid by the Corporation in connection with such
repurchase and (II) the aggregate Fair Market Value of such Preferred Stock (or
other security). An adjustment made pursuant to this Section 8(g) shall become
effective immediately after the effective date of such repurchase. The
Corporation acknowledges that any repurchase described in Sections 8(f) or 8(g)
of this Warrant is subject to the restrictions set forth in that certain Bridge
Financing Agreement, dated as of August 1, 2000, among the Corporation, the
lenders party thereto and Morgan Stanley Senior Funding, Inc., as Administrative
Agent thereunder, as amended from time to time.

(h)  Exempt Issuances. Notwithstanding anything herein to the contrary, no
adjustment to the Warrant Share Amount shall be caused pursuant to Sections 8(d)
or (e) by (i) (x) the granting of options pursuant to a stock option or
incentive plan maintained by the Corporation or the issuance of shares of Common
Stock upon the exercise of such options, so long as any such plan has been
approved by the Board of Directors of the Corporation and any such options have
been granted at an exercise price equal to the fair market value of the Common
Stock at the time of such grant (such fair market value to be determined
pursuant to a reasonable methodology and in accordance with the terms of the
relevant plan), and (y) the issuance of up to 100,000 shares of Common Stock as
restricted stock under a stock option or incentive plan maintained by the
Corporation, or to directors, employees, consultants or other service providers
of the Corporation in connection with their service to the Corporation; (ii) the
issuance of warrants, and the issuance of shares of Common Stock upon the
exercise thereof, in connection with any debt or equity financing consummated by
the Corporation, or (iii) the issuance of Common Stock by the Corporation as
consideration for any acquisition; provided that the exclusions described in
clauses (ii) and (iii) shall be applicable only to the extent that the aggregate
number of shares of Common Stock, together with the number of shares of Common
Stock for which any warrants are exercisable, does not exceed 1% of the
outstanding shares of Common Stock as of the date hereof.

(i)  Adjustment of Exercise Price; Certain Determinations. Upon each
adjustment of the Warrant Share Amount as a result of the calculations made in
the preceding paragraphs of this Section 8, the Exercise Price hereunder
immediately after giving effect to such adjustment shall be equal to (A) the
product of (i) the Warrant Share Amount immediately prior to such adjustment
times (ii) the Exercise Price immediately prior to such adjustment divided by
(B) the Warrant Share Amount in effect immediately after such adjustment. In
making any calculations in paragraphs (c), (d), (e), (f) or (g) above of this
Section 8, the value of any non-cash consideration received or paid by the
Corporation or any non-cash dividend or distribution made by the Corporation
shall be determined by the Board of Directors of the Corporation, and such
determination shall be conclusive.

(j)  Certificate as to Adjustments. Upon the occurrence of each adjustment
or readjustment of the Warrant Share Amount pursuant to this Section 8, the
Corporation at its expense shall promptly compute such adjustment or
readjustment in accordance with the terms hereof and furnish to the Holder a
certificate setting forth such adjustment or readjustment and showing in detail
the facts upon which such adjustment or readjustment is based. The Corporation
shall, upon the written request at any time of the Holder, furnish or cause to
be furnished to the Holder a like certificate setting forth (1) such adjustments
and readjustments and (2) the number of shares of Common Stock and the amount,
if any, of other property which at the time would be received upon the exercise
of this Warrant.

(k)  Notices. (i) In the event that the Corporation shall propose at any
time to effect any transaction of the type described in Sections 8(a) through
8(g) hereof or to take any similar extraordinary corporate action affecting the
Corporation's capital stock, then, in connection with each such event, the
Corporation shall send to the Holder at least 10 days' prior to (x) in the case
of a dividend or other distribution, the applicable record date, a notice
specifying the record date for purposes of such dividend or distribution and the
date on which such dividend or other distribution is to be made, and (y) in any
other case, the date on which such event is to become effective or the first
date on which the Corporation intends to effect any such transaction, as the
case may be, in each case specifying in reasonable detail what the transaction
or event consists of and, if applicable, the aggregate amount or value of any
cash or property proposed to be distributed, paid, purchased or received by the
Corporation in connection therewith.

(ii)  In the event of (x) any voluntary or involuntary dissolution,
liquidation or winding up of the Corporation, (y) any consolidation, merger or
sale described in Section 9 below or (z) any registered public offering of
capital stock by the Corporation or other sale of the Corporation, the
Corporation shall provide to the Holder at least 10 days' prior written notice
thereof.

(iii) Unless notice is otherwise required pursuant to Section 8(h)(i) or
(ii) hereof, the Corporation shall send written notice to the Holder immediately
upon any public announcement with respect to an open market repurchase program
for, any self-tender offer for and any other repurchase of shares of Common
Stock, other than repurchases in the ordinary course of business of Common Stock
issued in connection with the exercise of options outstanding on the date hereof
or issued in the ordinary course of business consistent with past practice
pursuant to the terms of any employee stock incentive plan adopted by the
Corporation (x) from employees of the Corporation upon their death, termination
or retirement or (y) upon foreclosure pursuant to loans outstanding on the date
hereof or made in the ordinary course of business by the Corporation to
employees of the Corporation secured by Common Stock.

9. Consolidation, Merger, or Sale of Assets. In case of any consolidation of the
Corporation with, or merger of the Corporation into, any other Person, any
merger of another Person into the Corporation (other than a merger which does
not result in any reclassification, conversion, exchange or cancellation of
outstanding shares of Common Stock) or any sale or transfer of all or
substantially all of the assets of the Corporation to the Person formedby such
consolidation or resulting from such merger or to the Person that acquires such
assets pursuant to any such sale or transfer of all or substantially all of the
assets of the Corporation, as the case may be, the Holder shall have the right
thereafter to exercise this Warrant for the kind and amount of securities,
cash and other property receivable upon such consolidation, merger, sale or
transfer by a holder of the number of shares of Common Stock for which this
Warrant may have been exercised immediately prior to such consolidation, merger,
sale or transfer. Adjustments for events subsequent to the effective date of
such a consolidation, merger, sale or transfer of assets shall be as nearly
equivalent as may be practicable to the adjustments provided for in this
Warrant. In any such event, effective provisions shall be made in the
certificate or articles of incorporation of the resulting or surviving
corporation, in any contract of sale, merger, conveyance, lease, transfer or
otherwise so that the provisions set forth herein for the protection of the
rights of the Holder shall thereafter continue to be applicable; and any
such resulting or surviving corporation shall expressly assume the obligation to
deliver, upon exercise, such shares of stock, other securities, cash and
property. The provisions of this Section 9 shall similarly apply to successive
consolidations, merger, sales, leases or transfers.

10.  Notices. Any notice, demand or delivery authorized by this Warrant
shall be in writing and shall be given to the Holder or the Corporation, as the
case may be, at its address (or facsimile number) set forth below, or such other
address (or facsimile number) as shall have been furnished to the party giving
or making such notice, demand or delivery:

         If to the Corporation:

         Choice One Communications Inc.
         1 HSBC Plaza
         100 Chestnut Street
         Suite 1600
         Rochester, New York 14604
         Attention:   John Zimmer
         Telephone: 716-530-2619
         Telecopy:   716-530-2734

         with a copy to:

         Nixon Peabody LLP
         Clinton Square
         200 Broad Street
         Rochester, New York  14604
         Attention:   James A. Locke, III
         Telephone: 716-263-1000
         Telecopy:   716-263-1600

         If to the Holder:

         Morgan Stanley & Co. Incorporated
         1633 Broadway - 26th Floor
         New York, NY 10019
         Attention:  James Morgan
         Telephone:  212-537-1470
         Telecopy:  212-537-1867

Each such notice, demand or delivery shall be deemed received on the date of
receipt by the recipient thereof if received prior to 5 p.m. in the place of
receipt and such day is a business day in the place of receipt. Otherwise, any
such notice, request or communication shall be deemed not to have been received
until the next succeeding business day in the place of receipt.

11.  Rights of the Holder. Prior to the exercise of this Warrant, the
Holder shall not, by virtue hereof, be entitled to any rights of a shareholder
of the Corporation, including, without limitation, the right to vote, to receive
dividends or other distributions, to exercise any preemptive right or to receive
any notice of meetings of shareholders or any notice of any proceedings of the
Corporation except as may be specifically provided for herein.

12.  GOVERNING LAW.  THIS WARRANT AND ALL RIGHTS ARISING HEREUNDER SHALL BE
CONSTRUED AND DETERMINED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF
DELAWARE, AND THE PERFORMANCE THEREOF SHALL BE GOVERNED AND ENFORCED IN
ACCORDANCE WITH SUCH LAWS.

13. Amendments; Waivers. Any provision of this Warrant may be amended or
waived if such amendment or waiver is in writing and signed, in the case of an
amendment, by the Holder and the Corporation, or in the case of a waiver, by the
party against whom the waiver is to be effective; provided this Warrant can be
amended and the rights of a Holder may be waived by an amendment or waiver which
applies equally to all Holders and Warrants and which is in writing and signed
by the Majority Warrant Holders and, in the case of an amendment, by the
Corporation; provided further that any such amendment or waiver that purports to
(i) increase the Exercise Price, (ii) decrease the number of shares of Common
Stock for which this Warrant is exercisable at any time (including by operation
of Section 8), or (iii) shorten the Expiration Date, must be in writing and
signed by all Holders and the Corporation. No failure or delay by either party
in exercising any right, power or privilege hereunder shall operate as a waiver
thereof nor shall any single or partial exercise thereof preclude any other or
further exercise thereof or the exercise of any other right, power or privilege.
The rights and remedies herein provided shall be cumulative and not exclusive of
any rights or remedies provided by law.



<PAGE>




         IN WITNESS WHEREOF, the Corporation has duly caused this Warrant to be
signed by its duly authorized officer and to be dated as of November 9, 2001.

                                   CHOICE ONE COMMUNICATIONS INC.
                                     By: /s/ John J. Zimmer
                                 -----------------------------------------------
                                 Name: John J. Zimmer
                                 Title: Vice President, Finance and
                                 Treasurer
Acknowledged and Agreed:

MORGAN STANLEY & CO.
   INCORPORATED


By: /s/ Elizabeth R. Chandler
-------------------------------------------
Title: Managing Director


<PAGE>






                          WARRANT EXERCISE NOTICE FORM


To:      Choice One Communications Inc.


         The undersigned irrevocably exercises the Warrant for the purchase of
___________ shares of common stock, par value $0.01 per share, of Choice One
Communications Inc. (the "CORPORATION") (the "SHARES") at $_____ per Share (the
Exercise Price currently in effect pursuant to Warrant No. [______](the
"WARRANT") and [herewith makes payment of $___________ (such payment being made
in immediately available funds in cash or by certified or official bank or bank
cashier's check payable to the order of the Corporation or by any permitted
combination of such cash or check)], [hereby authorizes the Corporation to
withhold ______ shares (being the number of Shares which when multiplied by the
Fair Market Value of one Share equals $______ [the amount of the Exercise Price
for all Shares, including the withheld shares],)] all on the terms and
conditions specified in the Warrant, surrenders the Warrant and all right, title
and interest therein to the Corporation and directs that the Shares deliverable
upon the exercise of the Warrant be registered or placed in the name and at the
address specified below and delivered thereto. Capitalized terms used but not
defined herein shall have the meanings ascribed thereto in the Warrant.

Date: ______________


---------------------------------------------------------
               (Signature of Owner)



---------------------------------------------------------
(Street Address)



---------------------------------------------------------
(City)                (State)                 (Zip Code)




<PAGE>



Securities and/or check to be issued to:

Please insert social security or identifying number: ________________________

Name:____________________________________________________________

Street Address:_____________________________________________________

City, State and Zip Code:_____________________________________________


Any unexercised portion of the Warrant to be issued to:

Please insert social security or identifying number:_________________________

Name: ____________________________________________________________

Street Address: _____________________________________________________

City, State and Zip Code: _____________________________________________


<PAGE>








                             WARRANT ASSIGNMENT FORM



                                                   Dated ___________ ___, _____


        FOR VALUE RECEIVED, ______________________

hereby sells, assigns and transfers unto_____________________________(the
"ASSIGNEE")                        (please type or print in block letters)

---------------------------------------------------------------
                    (insert address)

its right to purchase _____ shares of Common Stock represented by this Warrant
and does hereby irrevocably constitute and appoint ______________________
Attorney, to transfer the same on the books of the Corporation, with full power
of substitution in the premises.



                                             Signature: _______________________