Summary of AVISTAR COMMUNICATIONS CORP

Item 1.01 Entry into a Material Definitive Agreement

On February 2, 2012, Avistar Communications Corporation ("Avistar" or the "Company"), as subtenant, entered into a sublease agreement (the "Sublease Agreement") with Webroot Inc, a Delaware corporation (the "Sublandlord"), effective as of February 1, 2012, to sublease approximately 13,384 square feet of office space located at 1855 South Grant Street, 4th Floor, San Mateo, California 94402 (the "Premises"). The Sublease Agreement is subject and subordinate to that certain Master Lease Agreement by and between the Sublandlord, as tenant, and Crossroads Associates and Clocktower Associates, as landlord, dated March 17, 2010. The office space will be used as Avistar's corporate headquarters, replacing the Company's current lease with Crossroads Associates and Clocktower Associates for the office space located at 1875 South Grant Street, 10th Floor, San Mateo, California 94402.

The term of the Sublease Agreement will commence on May 1, 2012 (the "Commencement Date") and will terminate on April 30, 2015 (the "Sublease Term"). The Company shall have no right to extend the Sublease Term. The Sublease Agreement provides the Company with rent-free early access to the Premises on or after February 15, 2012 and prior to the Commencement Date.

Under the Sublease Agreement, the Company will pay a monthly base rent of $32,121.60 per month for the third through the twelfth month of the Sublease Term, $33,460.00 per month for the thirteenth through twenty fourth month of the Sublease Term, and $34,798.40 per month for the twenty fifth through thirty sixth month of the Sublease Term. No rent will be due for the first two months of the Sublease Term. Additionally, throughout the Sublease Term, the Company shall pay the Sublandlord its share of certain additional operating costs as specified in the Sublease Agreement. Pursuant to and upon execution of the Sublease Agreement, the Company will pay a security deposit of $31,121.60 and the first full month rent of $31,121.60 (to be applied to the third month of the Sublease Term) to the Sublandlord.

The foregoing summary description of the Sublease Agreement does not purport to be complete and is qualified in its entirety by the terms and conditions of the Sublease Agreement, which is filed as Exhibit 10.1 hereto and incorporated herein by reference.