FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person *   Mueller Brenda L 2. Date of Event Requiring Statement (Month/Day/Year) 05/07/2010 3. Issuer Name and Ticker or Trading Symbol DIGI INTERNATIONAL INC [DGII] (Last) (First) (Middle) 11001 BREN ROAD EAST 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Corp Cntrlr & Actg Fin Ofcr 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) MINNETONKA, MN 55343 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock 7,313.793 (1) D Â

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (right to buy)	  (2)	06/11/2011	Common Stock	3,000	$ 9.01	D	Â
Employee Stock Option (right to buy)	  (2)	09/28/2011	Common stock	3,339	$ 5.2	D	Â
Employee Stock Option (right to buy)	  (2)	11/06/2012	Common Stock	5,000	$ 2.4	D	Â
Employee Stock Option (right to buy)	  (2)	11/05/2013	Common stock	10,000	$ 9.65	D	Â
Employee Stock Option (right to buy)	  (2)	11/22/2014	Common Stock	7,500	$ 14.74	D	Â
Employee Stock Option (right to buy)	  (3)	11/28/2015	Common Stock	10,000	$ 12.73	D	Â
Employee Stock Option (right to buy)	  (4)	11/27/2016	Common Stock	12,500	$ 13.41	D	Â
Employee Stock Option (right to buy)	  (5)	11/27/2017	Common Stock	7,500	$ 15.23	D	Â
Employee Stock Option (right to buy)	  (6)	11/25/2018	Common Stock	6,500	$ 8.49	D	Â
Employee Stock Option (right to buy)	  (7)	11/24/2019	Common Stock	6,000	$ 8.03	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Mueller Brenda L 11001 BREN ROAD EAST MINNETONKA, MN 55343	Â	Â	  Corp Cntrlr & Actg Fin Ofcr	Â

Signatures

/s/Brenda L. Mueller		05/14/2010
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	All shares purchased pursuant to an employee stock purchase plan.
(2)	Fully vested.
(3)	25% of the option vested on November 28, 2006. The remaining shares of the option vest ratably each month over the next 3 years.
(4)	25% of the option vested on November 27, 2007. The remaining shares of the option vest ratably each month over the next 3 years.
(5)	25% of the option vested on November 27, 2008. The remaining shares of the option vest ratably each month over the next 3 years.
(6)	25% of the option vested on November 25, 2009. The remaining shares of the option vest ratably each month over the next 3 years.
(7)	25% of the option will vest on November 24, 2010. The remaining shares of the option vest ratably each month over the next 3 years.

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