1. For unauthenticated enterprises, the maximum number of users is 100 and the maximum number of address books is 1000.

2. It has been certified as small-scale, with the largest number of users 1000. After reaching the upper limit, a larger scale of certification is needed; The initial number of people in the address book is 1000, which supports free application for expansion.

3. Certification for medium scale, with the maximum number of users 10000, and certification is required after the larger scale reaches the upper limit; The initial number of people in the address book is 10000, which supports free application for expansion.