JOINT FILING AGREEMENT

EXHIBIT 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, we, the signatories of the statement on schedule 13D to which this joint filing agreement is attached, hereby agree that such statement is, and any amendments thereto filed by any of us will be filed on behalf of each of us.

Dated: December 21, 2010
		STG UGP, LLC
		By:		/s/ Xxxx XxxXxxxxx
		Name:		Xxxx XxxXxxxxx
		Title:		Authorized Person*
		STG III GP, L.P.
		By:		STG UGP, LLC, its general partner
		By:		/s/ Xxxx XxxXxxxxx
		Name:		Xxxx XxxXxxxxx
		Title:		Authorized Person*
		STG III, L.P.
		By:		STG III GP, L.P., its general partner
		By:		STG UGP, LLC, its general partner
		By:		/s/ Xxxx XxxXxxxxx
		Name:		Xxxx XxxXxxxxx
		Title:		Authorized Person*
		STG III-A, L.P.
		By:		STG III GP, L.P., its general partner
		By:		STG UGP, LLC, its general partner
		By:		/s/ Xxxx XxxXxxxxx
		Name:		Xxxx XxxXxxxxx
		Title:		Authorized Person*
		XXXXXX XXXXXXXX
		By:		/s/ Xxxx XxxXxxxxx
		Name:		Xxxx XxxXxxxxx
		Title:		Authorized Person*