Contact Us

Customers' satisfaction is the best gift for us. So we welcome any question or suggestion about our products and website. Please do not hesitate to contact us. We'll try to help you as fast as possible, usually in one or two business days.

Email Addresses

Tech support:
Any suggestions, comments, technical questions and bug reports, etc.

Sales cooperation:
Any question about sales, order, pricing and discount information, license code, registration, and upgrade etc.

Office Location

Efficient Software (Chongqing Yifei Technology Co., Ltd.)

Rm. 17-2, Building A, Jinkemayi, No.184 Xinnan Rd., Beibuxin District, Chongqing
P.R.China 401147

Tel: +86-23-6306-5826

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Efficient Address Book
Efficient Diary Pro
Efficient Calendar
Efficient To-Do List
For Business
EfficientPIM Network
Efficient Address Book Network
Efficient Calendar Network
Efficient To-Do List Network
Efficient Reminder Network
Retrieve Registration Code
Technical FAQs
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